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Calculate the percent purity of a sample of impure oxalic acid, HC2O4 2H2O if 0.4006 g of this material requires a titration with 28.62

Calculate the percent purity of a sample of impure oxalic acid, HC2O4 2H2O if 0.4006 g of this material requires a titration with 28.62 mL of a potassium permanganate solution, 1.000 mL of which contains 5.980 mg of KMnO4. 2MnO4 (aq) + 5HCO4 (aq) + 6H+ (aq) 2Mn+ (aq) + 10C0(g) + 8H0 (1)

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