The iron content of hemoglobin can be determined by converting the iron to Fe2+ and titrating using MnO4-. A 5.0 g sample of hemoglobin requires 21.6 mL of 0.00310 M potassium permanganate. What is the percent of iron in the hemoglobin sample? (Atomic weights: Fe = 55.85, Mn = 54.94, O = 16.00). 8 H+ + MnO4 - + 5 Fe2+ ----> 5 Fe3+ + Mn2+ + 4 H2O