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IF M is the molecular mass of KMnO4 then equivalent mass of KMnO4 when it is used as an oxidising agent in acidic medium
KMnO4 has a Molar mass of 158.04 g/mol
 KMnO4 as an oxidizer in acidic media:
MnO4- + 8H+ + 5e- --> Mn2+ + 4H2O (gained 5 electrons from reductant)

I.e. Eq. wt. of KMnO4 = 158.04/5 = 31.61 grams/equivalent



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