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116. Solving a chemistry problem
Uploaded:
12.08.2022
Content: 4.rar 44,2 kB
Content: 4.rar 44,2 kB
Product description
4. Give an assessment of the quality of the cysteine substance (M.m. 121.16) in terms of quantitative content, taking into account the requirements of VFS 42-2633-95 (cysteine should be at least 98.5%), if during the analysis 0.2510 g was added to a sample of 0.2510 g 25 ml of a 0.1 M solution of iodine UCH (1/2 l2), and the iodine residue was titrated with a 0.1 M solution of sodium thiosulfate (KP = 0.9978), which consumed 4.39 ml. 25.10 ml of 0.1M sodium thiosulfate solution was used for the control experiment.
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