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Question

Which indicator we prefer to use in iodometric titration?

A
Starch
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B
Phenolphthalein
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C
1,10 phenathroline
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D
All of the above
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Solution

The correct option is A Starch

Iodometry, also known as iodometric titration, is a method of volumetric chemical analysis, a redox titration where the appearance or disappearance of elementary iodine indicates the end point.

The indicator that is usually chosen for titrations involving iodine is starch. Starch forms a dark blue complex with iodine. The end point in iodimetry corresponds to a sudden color change to blue. Likewise the end point in iodometry corresponds to a sudden loss of blue color due to the complex.


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