Meso-1‚2-diphenyl-1‚2-ethanediol with focus on stereoselectivity Method Please refer to the CEM3005W practical manual for details on experimental procedure. Results and Analysis {Limiting reagent} Mass benzoin = 2.0050g (0.00945 mole) Mass sodium borohydride = 0.4059g (0.0107 mole) Mass compound A used to form compound B = 1.0647g Results Mass (g) moles Molecular formula Yield (%) Mp (pure) Compound A 1.7458 0.00815 C14H14O2 86.22 138-139 Compound C 0.4255 0.001988 C14H14O2
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Prior to begin the experiment‚ preparation for some solutions is required to enhance the lab performance. The solutions needed are standardized potassium bromate‚ standardized sodium thiosulfate‚ and starch indicator. First‚ to prepare a starch indicator‚ pulverize 1g of soluble starch and add 15mL of water to make it as a paste-like substance. Dilute it with about 500mL of boiling water‚ and continue to heat until the mixture becomes clear. Cool it to room temperature and save it into a stoppered
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eLearning 2009 Publication No. 91860 Rate of Reaction of Sodium Thiosulfate and Hydrochloric Acid Rate Laws Introduction The purpose of this demonstration is to investigate the effect of sodium thiosulfate concentration on the rate of reaction of sodium thiosulfate with hydrochloric acid. The reaction‚ which produces solid sulfur‚ will be followed by measuring the time needed for the reaction mixture to become opaque. The results will be analyzed graphically to determine the order of
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Analysis of Soda Ash and Volumetric Analysis of a Carbonate-Bicarbonate Mixture Buti‚ Mary Daphne A. Department of Chemical Engineering‚ Faculty of Engineering University of Santo Tomas España‚ Manila Abstract Sodium carbonate (Na2CO3)‚ commonly known by trade name soda ash‚ is a white‚ anhydrous‚ powdered or granular material that is an essential raw material used in the manufacturing of glass‚ detergents‚ chemicals‚ and other industrial products. In this experiment‚ the percent alkalinity
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Lab 4. Volumetric Determination of Impure Sodium Carbonate (Na2CO3) Introduction: To determine the total amount of carbonate in unrefined sodium carbonate‚ soda ash‚ a titration is done using a standardized solution of HCl. Aqueous HCl is a strong acid and therefore almost completely disassociates into H+ and CL-. Therefore‚ when HCl is used in a titration‚ the H+ is the titrant. Carbonate in aqueous solution is able to accept a proton‚ i.e. it acts as a base. When carbonate accepts the H+ a bicarbonate
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Case 13 Reducing Fertility in Bangladesh Geographic area: Bangladesh Health condition: in the mid-970s‚ a Bangladeshi woman had more than six children on average. in combination with poor nutrition and lack of access to quality health services‚ this high fertility rate jeopardized the health of both the woman and her children. Beyond the health impact‚ high fertility and rapid population growth represented a major constraint to the country’s economic development and social progress. Global importance
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uncertainty reduction theory from its origin to date. Ever since uncertainty reduction theory was first created‚ many researchers have examined it by comparing it with other theories. Uncertainty reduction theory had been tested across different cultures in order to confirm its generalizability. It had also been applied to real life situations to examine how individuals interact in their initial encounters with strangers. In addition‚ researchers suggested testing uncertainty reduction theory beyond
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By Vivian Cheng Health: Period 4 Mrs. Darpino December 2011 By Vivian Cheng Health: Period 4 Mrs. Darpino December 2011 Harm Reduction Theory Harm Reduction Theory Vivian Cheng Health Period 4 December‚ 2011 “Harm Reduction Theory” The war against drugs is an unwinnable war. Today‚ this seems to be a growing argument in the modern world. In a study performed in 2009‚ it was found that approximately 8.7% of Americans‚ twelve years
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Clostridium Difficile People getting medical care can catch serious infections called healthcare-associated infections or HAI’s. One type of HAI which is caused by the germ Clostridium Difficile or C-Diff. In 2015 it was estimated almost half a million infections in the United Ststes‚ and 29‚000 died within 30 days of the initial diagnosis. Those most at risk are older adults‚ who take antibiotics and also get medical care. The CDC provides guidelines and tools for the healthcare population to help
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Titus‚ Godley and White‚ 2006; Dennis‚ et al.‚ 2007) thus an alternative method to preventing further problems is the concept of harm reduction. This essay will thereby explore the strategies of harm reduction including its potential negative and positive aspects for injecting drug users and its relation to crime. Furthermore‚ it will explore extended harm reduction services specifically for drug users in Austria. Injecting drug use is acknowledged in 135 countries (UNODC‚ 2004) and is associated
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