MH-Titrimetric Analysis of Vitamin C - THE TITRIMETRIC...

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THETITRIMETRICANALYSIS OFVITAMINCTopics for Study:oxidation numbers, oxidation-reduction reactions.TECHNICAL ANDTHEORETICALSKILLSIn this assignment you willuse an analytical balancemake a standard solutionuse a volumetric pipetmake a volumetric solutionperform a redox titrationdetermine the composition of a commercial vitamin C tabletSAFETYPRECAUTIONDispose of the remaining KIO3solution in the “Waste oxidants” container and theNa2S2O3solution in the “Waste Reducing agent” container.INTRODUCTIONThere are two parts to this experiment.In the first part, you will prepare a primarystandard potassium iodate, KIO3, solutionand use it to standardize a sodium thiosulfate solution.In the second part you will determine the amount of vitamin C in a vitamin C tablet by titrationusing your standard sodium thiosulfate solution.BACKGROUNDThe human body does not synthesize vitamins; therefore, the vitamins that we need forcatalyzing specific biochemical reactions must be acquired through the food that we eat.Vitamin C (ascorbic acid) is found in many fruits and vegetables, particularly in citrus fruitjuices.It is also one of the more popular additives in modern food-processing technology sinceit prevents the enzymatic browning that frequently occurs with cut fruits and vegetables. Storageand processing, however, causes vegetables to lose a part of their vitamin C content.Boiling orsteaming extracts the water-soluble vitamin C from the vegetables and high temperatureaccelerates its degradation by air oxidation.Thus, eating raw, freshly harvested fruits andvegetables maximize your intake of vitamin CLong before the structure was elucidated, the therapeutic ability of vitamin C to preventscurvy was known.In 1775, the British explorer Captain James Cook required that all his sailorsbe issued rations of lime juice.His three-year, extensive exploration of the South Pacific wasequally notable for the health that his crew maintained.To this day, the slang term “limey”

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Term
Summer
Professor
Henary

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