37. Решение задачки по химии №12

1. Chromium contained in 1.870 g of technical chromite (FeO*Cr2O3) was oxidized to the hexavalent state (CrO42-). After acidification, 50 ml of a 0.160 N Fe2+ solution were added to the solution. 3.05 ml of a 0.0080 mol/l K2Cr2O7 solution were used to titrate the residue. What is the % chromium content in the sample?

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