Experiment 8 the Analysis of Household Bleach

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Experiment 8: Redox: Analysis of the Oxidizing Capacity of Bleach
PURPOSE
In this experiment, you will show how redox reactions can be used to quantitatively determine the amount of oxidizing agent in liquid hypochlorite household bleach.
There are two oxidation-reduction reactions for determining the oxidizing capacity of bleach. Initially an excess of iodide ions are added to a bleach solution. The iodide ions are oxidized to iodine after the solution has been acidified. Starch is added to the resulting iodine solution as an indicator. The solution is then titrated with sodium thiosulfate until the color of the solution changes indicating the endpoint of the reaction. Data collected from the titrations will be used to calculate the mass of the sodium hypochlorite in an unknown solution of bleach. Given the original mass of the unknown solution and the calculated mass of the sodium hypochlorite in the unknown solution, the percent by mass of the sodium hypochlorite can be determined. The oxidizing capacity of the unknown bleach is effectively the percent by mass of the sodium hypochlorite in the unknown bleach sample.
OJECTIVES
1) Titration of a sample of bleach with thiosulfate.
2) Determining the end point of the titration with starch indicator.
3) To determine oxidizing capacity of bleach by determining the percentage by mass of the bleach that is sodium hypochlorite. 4) Balance and summarize the two redox reactions to determine the overall chemical reaction that occurs during the titration.
PRINCIPLES
Oxidizing Capacity of Bleach
The effectiveness of a bleach to whiten and remove stains in white clothing is related to the oxidizing (bleaching) strength of an oxidizing agent, such as OCl−, which is found in common household bleaches. The hypochlorite ion is generally present as a sodium salt, NaOCl, or a calcium salt, Ca(ClO)2.
There are two redox…...

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