(a) A 0.3147-g sample of primary-standard-grade Na2C2O4 was dissolved in H2SO4 and titrated with 31.67 mL of dilute KMnO4:
2MnO4- + 5C2O42- + 16H+ →
2Mn2+ + 10CO2(g) + 8H2O
Calculate the molar concentration of the KMnO4 solution.
(b) The iron in a 0.6656-g ore sample was reduced quantitatively to the + 2 state and then titrated with 26.75 mL of the KMnO4 solution from part (a). Calculate the percent Fe2O3 in the sample.
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