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Potassium Dichromate

If molecular ...

Question

If molecular weight of $K M n O_{4}$ is $158$ , then its equivalent weight (nearest integer) is _______ in acidic medium.

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Solution

In acidic medium, $K M n O_{4}$ is reduced to $M n S O_{4}$ .
One mole of $K M n O_{4}$ accepts $5$ moles of electrons to form one mole of $M n S O_{4}$ in acidic medium.
$Equivalent weight = \frac{molecular weight}{number of electrons transferred} = \frac{158}{5} = 31.6 = 32$

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