Chemistry Level 4

A 2 g sample of \(\ce{MnSO4.4H2O}\) containing some other inert impurities is strongly heated in air. The residue (\(\ce{Mn3O4}\)) left was dissolved in 100 ml of 0.1 N \(\ce{FeSO4}\) .

The excess of ferrous ions left in solution were titrated with 50 ml of \(\ce{KMnO4}\) solution in acidic medium.

25 ml of this same stock solution of \(\ce{KMnO4}\) solution was completely reduced by 30 ml of 0.1 N \(\ce{FeSO4}\) solution.

Calculate the percent purity of the sample to the nearest integer value.


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