Analysis of available chlorine in household bleach

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Analysis of available chlorine in household bleach

INTRODUCTION

Volumetric analysis is a common quantitative technique to obtain unknown concentration of a solution with a known volume by reacting it with a standard solution that has a known volume as well as an accurately known concentration. Standard solution can be obtained by reacting a solution against another solution whose concentration is known accurately or by dissolving a primary standard in a known volume of water.

The procedure of mixing the two solutions until they have just reacted completely, using burettes and pipettes, is known as titration. The equivalence point is the point when correct stoichiometric amounts of the chemicals are present. At the equivalence point of an acid-base reaction, the solutions are neutralised. The end point is the stage at which the indicator changes colour and when using an acid-base indicator, it is important to choose an indicator that changes colour close to the correct pH value at the end point.
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Back titration can be used when the reagents are so weak acids or bases that they do not produce a sharp colour change at the end point.

AIM

To determine the 'available chlorine' in household bleach by redox titration.

APPARATUS & METHOD

Refers to 'Experiment- Analysis of available chlorine in household bleach'

QUESTION

. The average of the three concordant titres of sodium thiosulfate solution

Titre 1 = 16.5 ml

Titre 2 = 14.9 ml

Titre 3 = 16.4 ml

The average = 15.93ml

2. Using ...

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