Assume that the iron in iron ore (a mixture of iron and other substances) is in the form of Fe3+. The iron content of iron ore can be determined by dissolving the iron ore in HCl. The dissolved Fe3+ (aq) from the iron ore is then reduced to Fe2+
e- + Fe3+ → Fe2+
This solution is then titrated with KMnO4 (aq).
8 H+ (aq) + 5 Fe2+ (aq) + MnO4- (aq) → Mn2+ (aq) + 5 Fe3+ (aq) + 4 H2O (l)
Suppose a 0.6128 g sample of iron ore is dissolved in HCl (aq), reduced, and titrated with 41.95 mL of 0.0205 M KMnO4 (aq). What is the mass percent of iron in the iron ore sample?