Discussion 8 - Lauren Taranow 11-6-11 Section 51070 lmt827...

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Lauren Taranow lmt827 11-6-11 Section 51070 Experiment 8: The Analysis of Household Bleach This experiment is designed to teach how to determine the oxidizing capacity of household bleach by finding the percent mass of sodium hypochlorite in it through a titration with thiosulfate. Also, the experiment shows how to balance the redox equations of the chemical reaction in the titration. In the titration reaction, hypochlorite, the main ingredient in bleach, is reduced by two electrons to Chloride ions by iodide, and sodium thiosulfate is oxidized by two electrons to tetrathionate by iodine. The overall stoichiometric equation is: 2S 2 O 3 2- (aq) + HOCl (aq) + H + (aq) S 4 O 6 2- (aq) + Cl - (aq) + H 2 O (l) . Sodium hypochlorite (NaOCl) and sodium hydroxide (NaOH) are salts that acted as oxidizing agents in bleach. In the titration, a mixture containing a sample of unknown concentration of bleach, potassium iodide, sulfuric acid, and 3% ammonium heptamolybdate are titrated with 1.0 M sodium thiosulfate solution. The bleach solution turns
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This note was uploaded on 04/02/2012 for the course CH 101 taught by Professor Sutcliffe during the Spring '08 term at University of Texas at Austin.

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Discussion 8 - Lauren Taranow 11-6-11 Section 51070 lmt827...

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