Complexometric Determination of Water Hardness Essay Example for Free

Complexometric Determination of Water Hardness Essay Abstract: Using complexometric method of calculating water hardness, an EDTA solution was made and calculated to be around .00209M. This EDTA solution was then used to titrate a water sample with unknown hardness. The sample used was sample #18. The hardness of the sample was calculated to be 180505 ppm. This is within normal levels for the Mesa area. Introduction: This experiment focuses on titration with EDTA. Titration is the determination of a given component in solution by addition of a liquid reagent of known strength until the endpoint is reached when the component has been consumed by reaction with the reagent. An indicator called Eriochrome Black T will enable detection when the EDTA has completely chelated the metal impurities. Chelation happens when a ligand (with more than one binding site) forms a complex with a metal ion. Ligands are complexes that form when the electron donating groups form coordinate covalent bonds through empty orbitals on the metal ion. This experiment contains Ammonium chloride buffer which is an inhalation irritant. Procedure: About 500 mL of approximately 0.004 M disodium EDTA solution needed. The solution should have between 0.7–0.8 g of Na2EDTA and dissolve in about 500Â  mL deionized water in a plastic bottle. The bottled is Sealed and shaken vigorously for a few minutes to dissolve the salt. Standardize the Na2EDTA solution using a stock calcium ion solution as the primary standard. Using a 10-mL transfer pipet to add 10.00 mL of standardized calcium ion stock solution (1.000 g CaCO3/L solution) to a 250-mL Erlenmeyer flask which will have an additional 30 ml of deionized water to this titration flask. Adding a magnetic stir-bar the solution was then stirred. about 3 mL of ammonia/ammonium chloride buffer is added to the solution. Just prior to titrating the flask, adding four drops of Eriochrome Black T indicator solution will be needed. At the endpoint, the color will change from pink to violet to blue. This will repeat two more times. Then Choose one prepared unknown water sample as provided. Record the unknown code in a notebook, then titrate this water sample with your standardized disodium EDTA solution. Transferring 25.00 mL of the prepared water sample to a 250-mL Erlenmeyer flask will be done. Then Add about 20 ml of DI water to the titration flask, which will have a magnetic stir-bar. The solution will have an added portion of 3 mL of ammonia/ammonium chloride buffer. The solution will then change color as previously examined in the first portion. This procedure will be repeated twice more. Results and Discussion: EDTA solution Initial Reading (mL) (mL) delivered 0.0mL 50.01mL 0.0mL 47.05mL 0.0mL 46.10mL The average of the mL delivered of the three results is 47.72 mL The Molarity of the EDTA solution was calculated and is shown below. Ppt: 15.99 for 50.01 mL delivered Ppt: 4.68 for 47.05 mL delivered Ppt: 11.31 for 46.10 mL delivered Unknown solution Initial Reading(mL) (mL) delivered 0.0mL 22.9mL 0.0mL 21.41mL 0.0mL 20.41mL The average of the mL delivered of the three results is 21.57 The hardness of the unknown water sample was calculated using the Molarity of the EDTA solution standardized in the first portion of the lab. The calculation is shown below. Ppt: 20.55 for 22.9 mL delivered Ppt: 2.47 for 21.41 mL delivered Ppt: 17.92 for 20.41 mL delivered The tables reveal a difference in (mL) delivered in comparing the first experiment to the unknown. The unknown must have a weaker tolerance to the indicator in which the first experiment is stronger. Conclusion: The water hardness in Mesa ranges from 12 gpg (grains per gallon) to 22 gpg (1). The Ppt of the unknown and EDTA do and don’t fall within Mesa’s range. There are some numbers that fall within the range and there are some that may fall out. Overall the data has some proof that the water hardness of the EDTA and unknown can potential match up to Mesa’s. Sources: (1) http://www.mesaaz.gov/water/hard_water.aspx

Education: The Social Institution | Research

Education: The Social Institution | Research Introduction Education is one of social institution that makes society and the country sustainable and development. With education, people acquire knowledge, skills, habit, value, and morality, and attitude (Roth Hok, 2004, p 3). It provides the country workforce in order to meet the challenge of globalization of today competitive economic and technological development. Accordance with the needs above, each country try to build up quality of education, enlarge and widespread the educational building centers, schools and universities everywhere in the country. Moreover, they provide the chance to those who want to work on the educational sectors which aspect as private sector or organization. Additionally, the educational institution tries to reform and generate more method, structure or other techniques to improve the educational system. There are four functions of education: enculturation, qualification, allocation and legitimation (Historical Root Document) in which each function plays very imp ortant role and works in deferent aspect that education become more and more effective. In order to stabilize and develop the country more effectively, legitimation is one of the most important functions, which have been applying actively in education. In term of educational aspect, legitimation is the tool to establish and link the people in society. It provides norm, values and ideology to stabilize the political power and also cultural and social identity (Historical Root Document). Cambodia is one of the developing countries which has just emerged from the war that the education had been distracted to almost zero. According to Mr. Heng stated that Having passed four years of the barbaric genocidal regime of the Pol Pot- Ieng Sary clique our infrastructure in the domain of education and teaching is completely shattered. (Ayres, 2003). Now it has been struggling very hard to become the developed country by focusing much on the education as the main sector that education in term of legitimation has been applied more potentially in the Cambodian context in order to stabilize, nationalize the nation as a whole. Research Questions What is the main factor to shape the curriculum in Education? How did the education curriculum in PRK and later apply the social and national vision to the citizens? How effective have the education system work in conceptualize the citizen for stabilizing the country? Education in Cambodia in term of Legitimation In Cambodia, from one period to another, the curriculum has been changed and reformed steadily in order to modernize and get a better quality to fulfill the need of society within the Cambodian context. The curriculum has been set and assimilated the ideology to the young Cambodian to be harmony, peace, stability and feeling of loving nation and society and also supports and serves their political power. On the other hand, curriculum has policies to correct and encourage the students to learn more and understand their obligation as students to respect the school regulations and laws, avoid committing the crime in society that is unacceptable. Additionally, the curriculum has provided them how to be good citizens, know their national identity, love the national culture, think critically and live together peacefully. According to the curriculum the students are provided to learn the subjects that tell about the way of living, the way to speak, dress, stand, sit, and walk, it also provi des norms, value and persuade the young Cambodians to love and protect their own national heritage; moreover, the information the students get is to follow and support the government context that the nation become stability, prosperity and successful development. (Policy for Curriculum Development, 2005-2009) General goal of curriculum in term of legitimation The goals and aims of education are to develop human resources mentally, emotionally, and physically. It provides the learners to gain the real life experience in society. It also provides the learners to understand the value of education that is limited by the royal government. In reforming of educational system, the students can solve the faced problem in their life such as aids, traffic, domestic violence, human right, climate change, protect the environment, reduce the poverty and other conflicts in community and also the country. Education can erg all the learners to think about economics, religion, controversial land, governments concession land. When the learners understand about these problems they can work out these peacefully. As we know, when we reform the educational system, it usually effects both government and learners such as the government spend a lot of budgets and the learners are difficult to adapt with new programs. But we must reform it to progress better in cou ntry as well as in the religion. A good education gives the learners to get high knowledge to reply the need of ministries, departments, companies, enterprises, organizations and other institutions. If they get well paid job, they will help themselves, their families and country. When the learners are educated from schools with good curriculums, they will become very well educated persons who are very important asset in their society. Moreover, they can attract investors to invest in their community and also the country. One country has rapid development; it is because of the high knowledgeable learners. It is necessary cant be lake of them. (Research in Post-Compulsory Education, Vol. 3, No. 1, 1998) In PRK period In the period of People Republic Kampouchea regime, the government was in left with nothing in the hands as well as the education system. (Arys, 2000) With the official government was empty idea related to the education theory and practices, most of them were in the army sectors. In addition to this, the influence of cold war in the current flow of world power between Russia and the United State (Nayan Chanda, 2007) led to spread the ideology of socialism which affected on Cambodia government in education curriculum. However the new educational program had been announced officially in on July 30, 1979 in the PRK. The system had been put an effect by Heng samrin. The new educational structure had been replaced by the administration of Vietnamese and French educational practice. The primary school course had been divided into two three-year cycle prior to 1975, was reduced into four grade, secondary school six years to maximum three years cycle. The ten years structure and ascending nu mbering system followed the denote school grades, were very similar to those Vietnamese. Another feature of the system which the same as Vietnameses was the decentralized control. Provincial education committees were vested with a high degree of responsibility for making decision. (Ayres, 2003) In that way, education is to protect and build the Peoples Republic of Cambodia in to socialist country, (Ayres, 2003), so in the period the education is provided to the people in order to stabilize the country and improve the political power. After PRK period 1990s After the election in 1993, The Cambodia constitution has rehabilitation plans, the strategies of MoEYS, the strategies of socioeconomic, and the real national situation the education reform policy had been accepted by the education system development committees as the following: The general education system from grade 11 to 12 years added 1year to primary school that the formula is 6+3+3, which is 6 years in primary school, 3 years in secondary school 3 years in high school. They also increase up 6 hours per day in order to get the international standard of 5,000 hours in which one class period 45 minutes in primary school and 50 minutes in secondary school. There 6 subject areas in primary and 8 subjects in secondary school include foreign subjects (English or French) grade 5 in primary school upward. (UNESCO statistical yearbook, 1999) The goal of curriculum has been set to increase the quality of general education and adept with the globalization in order to easy to learn and teach more effectively that the students and teacher become very skillful and they can work very well and effectively in the class as they have expected to get high standard knowledge. (The effect of curriculum type on middle grade instruction, Vol. 5 pp.201). The curriculum has also helped them to learn thing which is fit to their ability to the situation in their own society as well as their family, community, and help next generation to love their own nation and people. Moreover the curriculum helps them to build up their capacity to improve the policy and develop their country. The curriculum can correct their habits how to live and work in their country peacefully. Thus they can be very important asset to work more effectively to develop the nation and liberal pluralistic democracy. (Policy for Curriculum Development, 2005-2009) Conclusion In conclusion, as I mentioned above, it is important to reform the educational system for all the learners. I deeply believe for good curriculums can drive the learners and country to grow up sharply. If in one country has lots of good learners, the country will develop faster. For example, the Unites State of America. This country is over 200 years old, but they develop all fields. If we compare with Cambodia, it is so far different. It shows that human resources from study with good curriculums help to improve all the fields in their country. The important of curriculums help the learners improve them to think about the problems properly such as social issue, family economics, land conflict, domestic violence, aids, traffic, human right, children right and other things the learners understand about climate change, environment issue, traditions, cultures, religion relieve and understand universal laws. In my ideas, I think that good curriculums are important for the learners to reac h and achieve their goals in their life. A good curriculum can lead the learners to do the right thing and they become good citizens, leaders in the future. Additionally, good curriculums help all the learners do and think something correctly that society and human being recognize. Totally, the reforming of curriculums drives the learner to love their people, culture, costume, national treasure, environment, government, leaders, and their country. (Policy for Curriculum Development, 2005-2009)

Bush Essay -- essays research papers

George Bush is not content with the United States being the top dog. His snarling at one international accord after another besmirches the United States and makes the world a more dangerous place. When Bush nixed at the ABM treaty, the comprehensive test ban treaty, the biological weapons protocol, and the small-arms convention, he sent an unmistakable signal that the United States doesn't care about arms control. This will only encourage other nations to bolster their own arsenals, and the arms race will accelerate on every track. And when Bush led the United States out of the Kyoto accord on global warming, he turned Washington into a laughingstock, with 178 nations on one side and the United States on the other. By not requiring U.S. companies, which produce a huge chunk of the world's carbon dioxide, to curb their emissions, Bush showed a reckless disregard for the environmental health of the planet. Like many know-nothings, Bush believes the United States is better than any other country. They're foreigners; what do they know? So what if 178 nations disagree with us? We've got the Holy Grail. We're so different from all these other nations that our interests can't possibly coincide with theirs. After returning from Europe on his first trip, he bragged to Peggy Noonan, his dad's speechwriter, that he stood down more than twenty leaders (no matter they were our allies) so he could stand up for America. Bush also has Kissinger's phobia: the morbid fear that other countries will drag U.S. soldiers or statesmen to The Hague or elsewhere for prosecution. Belgium is already trying to get its hands on Kissinger, and Bush wants to make sure that Americans elude any court outside our borders. The one job Bush takes seriously is that of chief executive of the corporate class. Boeing, Lockheed, and Philip Morris want to be able ply their wares without interference from any international body, so Bush undercuts those bodies at every opportunity. The World Health Organization, for instance, is trying to get countries to sign on to the Framework Convention on Tobacco Control, which would, among other things, limit advertising, raise cigarette taxes, eliminate subsidies, and consider the possibility of expanding the jurisdiction of the International Court of Justice so that tobacco companies could be tried for crimes against humanity. Tobacco killed four million p... ...to boycott the Kyoto protocol could cost U.S. companies business in the area of environmental technology." So even if Bush's ultimate objective is to boost the bottom line of U.S. corporations, he may be going about it the wrong way. Note that I haven't even mentioned the appointment of extremists like John Ashcroft and Theodore Olson, who will be advising Bush about whom to appoint to the federal bench; or Gale Norton, the James Watt protà ©gà ©e now heading the Interior Department, who believes polluters should be trusted to be self-policing; or Andrew Card, the automobile industry's chief lobbyist, now Chief of Staff; or Michael Powell, the new head of the FCC, who has no interest in moderating media mergers. And I haven't said a word about so-called social issues. We should not be surprised by the predatory nature of U.S. foreign policy. Until the U.S. government and until the American people get over their superiority complex, until they understand that United States and most other nations have common interests that transcend borders and jingos, that cooperation not domination is the way of the future, the foreign policy of the United States will have a familiar snarl.

Bongo.. Always American Made - Analysis Of Bongo Jeans Ad :: essays research papers

BONGO.. Always American Made - Analysis of Bongo Jeans Ad This ad for Bongo jeans is from the April issue of Seventeen magazine. The ad gives no written description of the product. Only symbols and hidden messages are used to draw in the reader and stir up interest in the product. There is an attractive young couple engaged in what appears to be a strip-poker game. The man is obviously losing. He is apparently nude behind a card table, wearing only his shoes, with his jeans draped over him. His briefs are on the floor under the table, reinforcing the fact that he is nude. He has a look of disbelief on his face, but at the same time, he looks happy and content. It is almost as if he is thinking, "Oh no, now I am nude. What will I do now?". The young lady has obviously not lost a single hand. She is fully clothed and seems to be in total control of the game and her life. This makes sense since the magazine the ad appears in is geared towards teenage girls. She sits in a somewhat sensual pose, leaning forward, with a look of confidence and achievement on her face. She obviously knows that her hand is a winner, and that her companion will soon be without even his shoes. On the table are two glasses of milk. This is one of the most powerful images in the ad. I believe they are there to counteract the sexual overtones and idea of risk-taking in the ad. Milk is included as if to say, "Even though these two young people are probably going to have sex when the game is finished, they are wholesome, good people." Milk works much better than using soft drinks, for example. If the makers of the ad had used cola for instance, the reader could not have really known if the liquid in the glasses was cola, dark beer, or liquor. By using milk, the people who produced the ad made certain that the reader could make no mistake about what the glasses contain. Surrounding the border of the ad are playing cards. I believe they represent the idea of gambling and a "Devil may care" attitude. The cards convey to the reader that its all right to gamble and take chances. They seem to say, "If you wear our jeans, you can take chances and still be in control." Teen age girls are looking for this type of message, so this ad is very effective in relaying this thought.

sports psychology Essay example -- essays research papers

Sports is by far one of the fastest growing past times in the United States (Rainer 1987). Even if people don't take it to the professional level, sporting events are happening in our backyards, and at all of our local schools around the country. With the growing popularity and the increasing competitiveness of the sports, it will take more than just a physical advantage to compete at the highest level. This is where the psychology of sports comes into play. Goal setting is a hugely powerful technique that can yield strong returns in all areas of an athlete’s life. At its simplest level the process of setting goals and targets allows people to choose where they want to go in life. By knowing what a person wants to achieve, they know what they have to concentrate on, and what is merely a distraction. Goal setting gives long-term vision, and short-term motivation. By setting goals the athlete can achieve more, improve performance, improve the quality of the training, increase the motivation to achieve, increase pride and satisfaction in their performance, and improve their self-confidence (Bull, 1983).Research (Bull, 1983) has shown that people who use goal-setting effectively suffer less from stress and anxiety, concentrate better, show more self-confidence, perform better, and are happier with their performance. The way in which an athlete sets his goals strongly affects their effectiveness. Before setting goals, the athlete should have set the background of goal setting by understanding their commitment to sports, understanding the level they want to reach within the sport, knowing the skills that will have to be acquired and the levels of performance that will be needed, and know where this will fit into their overall life goals. The following broad guidelines apply to setting effective goals. Positive statements, be precise, set priorities, write goals down to avoid confusion and give them more force, and keep operational goals small (Rainer, 1987). "Your body is a beautifully evolved sporting machine, comprising, among other things, muscles that can be trained to a peak of fitness and nerves that control the muscles" (Morris 1992). The nerves are massively linked in an athlete’s brain: vast numbers of nerve cells are linked with a hugely greater number of interconnections. Many of th... ...in negative thinking (Bull 1983). The athlete needs mental energy to be able to concentrate their attention and maintain good mental attitudes. If the athlete is concentrating effectively then the athlete can conserve physical energy by maintaining good technique when their muscles are tired. The athlete can waste mental energy on worry, stress, fretting over distractions, and negative thinking. Over a long competition, these not only damage enjoyment, but also drain energy so that performance suffers. It is therefore important to avoid these by good use of sports psychology, and by resting effectively between events and by ensuring that the athlete sleep properly. Sports psychology is a relatively new idea and just now it is becoming more of a normal thing rather than something only pro athletes do. The study of the mind and how it relates to sports is a beneficial thing that even our own school uses to help improve performance. Over the last two years our Varsity and JV boys basketball team has used a sports psychologist from Boulder two or three times during the year. Sports psychology is no longer looked down upon, it is now a legitimate practice.

Solar charger

As an experienced company specializing in designing, engineering, manufacturing and selling various kinds of products, such as accessories of computer and mobile phone, fashionable electronic product, electric gifts, novelty lights & lighting, promotional gifts & crafts and other various kinds of promotional items.Slinya owns not only the advanced production equipments and strong development strength, but also a group of technicians and veteran workers with rich skill and good rainings which are the backbone of the fast and convenient delivery and best service for customers. Customer's satisfication has always been main goal, Slinya has an professional quality team and many precision testing equipments to ensure that all products have the best quality control.They also have gotten the official certificates of IS09001 : 2000 ; IS014001 : 2004 from third party organization, and all products are internationally recognized with RoHS compliance. Slinya Group always hold on to technology c reation and marketing development, continuously promote our competition, and do the best to satisfy market's equirements with company's flexibility, so as to provide best service and best products to their customers. The products have been distributed and exported to many countries all around the world, such as the United States, Europe, South Asia, Middle East and other areas.They have won the high reputation and long term cooperation from customer both at home and overseas. Products and Services 10000mAh Power Bank Portable Solar Charger Rechargeable Solar Battery Product Features: product price RM105 per 1; 200 Pieces RM60 This product is a multi-function solar emergency charger. Meet an emergency: When you go to outside or power cuts, you also can use your mobile phone with solar energy. Convenience: Whenever and wherever you are, you can charge your mobile phone in time, and you could talk with others when charging.Environment protect, save resource: You can use solar energy to charge your mobile phone wherever and whenever. Exquisite workmanship, high-capacity Solar efficient charging Multi – voltage mode, extensive support for laptop and mobile digital devices Multiple intelligent security protection: over current, overvoltage, overload and short circuit rotection LED remaining power smart tips Capacity Input: DC 1 . OA (max) output: DC 5. OV 2. 1A (max) Solar panel: 1. W The battery indicator: 4-LED indicate (charging, full of bright blue light) Connectors for mobile phone: for iPhone 5, for iPhone, Micro USB adaptor, for Mini USB, For Nokia N70 Size: 132 x 14t-nrn weight: 226g Color: Black, Silvery, Hot Pink, Blue Package Included: 1 x 10000mAh Solar Battery Charger lx Charger Cable Charger Adapters lx Retail Package Shenzhen LETSOLAR Technology Co. , Ltd Shenzhen LETSOLAR Technology Co. , Ltd was established in 2005, the headquarter nd R;D department is located in Nanshan, Shenzhen city.We integrate research, development ; manufacture and spec ialize in solar charger as well as portable charger field. With strong R;D capacity, LETSOLAR not only continuously improve main products solar charger ; portable charger, but also develop solar lighting system, solar pack, solar torch, solar DIY kit, etc. They emphasize on products R;D and build a 7 people R;D team of electronic, structure, shape. All the products have China appearance patent. LETSOLAR also pay attention to products environmental property. All the products re under CE ; RoHS certificate and correspond with EIJ REACH regulations.Also some products are USA FCC approved. In 2012, LETSOLAR has moved to a new manufacturing base, the building area is more than 2,500 square meters. New factory including mold-tooling design, product development, plastic injection and manufacture process. In this way it will improve our R;D, manufacture and quality control capacity, and they can give you quick response and better service. Products ; Services Tiger senes Of LETSOLAR Big powe r solar Charger 6000mAh Product Detail Product Price RM 170 per 1 Brand name: Letsolar Type: Solar output: 5V/2. A ; 5V/1A Solar Panel: high efficiency solar panel Power display: LCD Place of Origin: Guangdong. China Input: 5V/1A Weight' 195g Use; Charger for all phones Battery: Li-Polymer Capacity: 6000mAh output port: 2 USB & Micro USB Size: 92mm x 152mm x 20mm Packaging & Delivery Packaging Detail: neutral package Delivery detail: 15 – 20 days after reiceve the paymenbt Specification 6000mAh Li-polymer battery, can charge iPhone 300% High efficiency solar panel Three output Inbuilt cable Self-charging time: 12 hours by laptop, 7 hours by 5WIA travel charger NingboYinzhou Guanya Optoelectronics Co. , Ltd. Ningbo Yinzhou Guanya Optoelectronics Co. , Ltd company was established on 2008, its professional in exporting solar products and portable chargers, aiming at global market. their goal is to supply green products to our customers with good quality and prices. The products include solar charger, foldable solar charger set, solar LED flashlight, solar keychain, outdoor solar light, portable charger, phone charger, power bank and so on.They are widely used in daily life, camping, travel, exploration, searching and for emergency use. They strictly execute IS09001 :2000 production standard to meet customer requirements. Most of the products are certified by CE, RoHS and EN-71. Our engineers could customize personalized design and packing to ensure their customers acquire the competitive products. They could also offer customers with OEM service to fit the distribution.Since 2012, we have issued a very important plan for opening oversea markets. We can supply DIA 30-120 DAYS services for our good customer to open their local market. We believe that in this way we can grow up together in the future.

My World In 2050 Essay

The world in which I live in the year 2050 is only marginally different than the one we lived in fifty years ago. Communication technology at this point is really the only thing that has advanced in great leaps. see more:life in 2050 In 2050, there are no more wires used in communication. No phone lines, no cables. Everyone has a satellite transmitter in their homes that can be used to transmit live video/audio feeds to anywhere in the world in a matter of seconds. This also means that the Internet is no longer dependant on modems, as we knew them at the turn of the century. Video imagers that allow people to communicate while seeing who you are speeking to have replaced the phones of the twentieth century. All banking, shopping and personal business can now be done in the comfort and privacy of your own home. This is probably the single most amazing thing about this time. Companies like FedEx, and UPS have become shipping giants of this time, with millions of employees and tens of thousands of offices all over the world. These companies are what make living in 2050 so unique. With more people spending less time going out to shop, shipping companies like these are the only way millions of people can survive. Back in the early 1980’s, I remember watching a movie called Aliens. I remember this well because there was a scene in the movie when Ripley, the main character, used a card inserted into a videophone that allowed her to see who she was talking to. At the time I was amazed at the special effects in this movie. Now of course all we need do is to speak the name and city of the person we want to talk to so that the communication computer can hear it and we are connected instantly. We no longer have to worry about garbled communications, or language barriers with the latest translator technology. Sure, the translators sound kind of boxy and computerize, but in time I think that even these bugs will be worked out. All in all, 2050 is an exciting time, and new things will be discovered every day. There is word that communication mega giant AT&T is developing a chip that can be implanted in the skull that would make  videophones obsolete in a few years. They say that all you have to do is think about calling someone and, boom, you are connected. Well, I guess only time will tell. For sure, seventy years ago, these things were probably considered outlandish ideas, but amazingly, life seems to imitate Sci-Fi. I mean, look at what the old Star Trek series did for Cell Phones.