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Peroxidisulfate (H2S2O8) is a strong degreaser. Because reducing agents are not very stable in air, it...

Peroxidisulfate (H2S2O8) is a strong degreaser. Because reducing agents are not very stable in air, it is typically analyzed by back titration. The peroxidisulfate is reacted with excess oxalate and then remaining oxalate is back titrated with potassium permanaganate. Impure H2S2O8 (FW 270.32, 0.5073g) was analyzed by treatment with 50.00 mL of 0.05006M C2H2O4. The excess oxalate required 16.52 mL of 0.02013M KMnO4 to reach the endpoint. Find the weight percent of peroxidisulfate in the impure sample. Please show work and explain thank you!

5 C2H2O4 + 2MnO4- + 6H+ -----> 10CO2 + 2 Mn2+ + 8H2O

H2S2O8 + H2C2O4------>H2SO4 + 2CO2

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