Back titration. Impure K2S2O8 (FM 270.32, 0.507 3 g) was analyzed by treatment with excess standard Na2C2O4 in H2SO4. After reaction with 50.00 mL of 0.050 06 M Na2C2O4, the excess oxalate required 16.52 mL of 0.020 13 M KMnO4. Find the weight percent of K2S2O8 in the impure reagent.

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