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Question

A 8 gm sample of iron are containing V% (by wt) of iron Fe2+ was present in 1 L solution. This solution required V mL of a KMnO4 solution for oxidation of Fe2+in acidic medium. If in another titration 20 mL of same KMnO4 is required, for oxidation of 20 mL H2O2 in acidic medium. Find volume strength of H2O2

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Solution

Meq. of Fe2+=meq. of KMnO4=8×V×1×1000100×56=NKMnO4×V
N=85.6
As equivalent weight of KMnO4 is same in both the experiment so , NKMnO4 is same in both.
Meq of KMnO4 =meq. of H2O2
20×85.6=20×N=20×Vol.strength5.6
So, volume strength of H2O2=8

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