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Question

Calculate the equivalent weight of KMnO4 in acidic medium.

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Solution

KMnO4 as an oxidizer in acidic media:

MnO4+8H++5eMn2++4H2O (gained 5 electrons from reductant)

To find out the Eq.wt of any element we use the formula, Eq.wt = molar mass/ no. Of electrons lost or gained.

Therefore, Eq. wt. of grams/equivalent

KMnO4=158.045=31.61


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