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Introduction to Oxidation and Reduction

The indicator...

Question

The indicator used in the titration of iodine against sodium thiosulphate is:

Starch

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K_{3} F e (C N)_{6}

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K_{2} C r O_{4}

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Potassium

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Solution

The correct option is A Starch
In an iodometric titration, a starch solution is used as an indicator since it can absorb the $I_{2}$ that is released. This absorption will cause the solution to change its colour from deep blue to light yellow when titrated with a standardized thiosulfate solution. This indicates the endpoint of the titration.

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