A 8gm sample of iron are containing V% (by wt) of iron Fe2+ was present in 1L solution. This solution required VmL of a KMnO4 solution for oxidation of Fe2+in acidic medium. If in another titration 20mL of same KMnO4 is required, for oxidation of 20mLH2O2 in acidic medium. Find volume strength of H2O2
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Solution
Meq.ofFe2+=meq.ofKMnO4=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. MeqofKMnO4=meq.ofH2O2 20×85.6=20×N=20×Vol.strength5.6
So, volume strength of H2O2=8