5 The chromium in a 1 0 g sample of chromite FeCr2O4 was oxidized to Cr 6 state by fusion with Na2O2 The fused mixture was

Question

5 The chromium in a 1 0 g sample of chromite FeCr2O4 was oxidized to Cr 6 state by fusion with Na2O2 The fused mixture was treated with excess of water and boiled to destroy the excess of peroxide After acidification the sample was treated with 50 mL of 0 16 M FeSO4 solution 3 67 mL of 0 05 M Cr O solution was required to oxidize the Fe2 ion left unreacted Determine the mass of chromite in the original sample Cr 52 Fe 56

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