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Allotropes of Sulphur

Why HNO3 is...

Question

Why $H N O_{3}$ is not used in place of dil. $H_{2} S O_{4}$ to acidify the $K M n O_{4}$ solution in volumetric analysis?

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Solution

In volumetric analysis, $K M n O_{4}$ solution is used for estimation of ferrous salts, oxalic acid etc.
$H N O_{3}$ is an strong oxidising agent and can oxidise ferrous salts to ferric salts. It can also oxidise oxalic acid to carbon dioxide.Hence, $H N O_{3}$ is not used in place of dil. $H_{2} S O_{4}$ to acidify the $K M n O_{4}$ solution in volumetric analysis.

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