The mass of sodium oxalate used to standardize a potassiumpermanganate solution

Question

The mass of sodium oxalate used to standardize a potassiumpermanganate solution is 0.7901 grams. The toal volume needed totitrate the solution was 23.3 mL. What is the molarity of the KMnO4 solution? The mass of sodium oxalate used to standardize a potassiumpermanganate solution is 0.7901 grams. The toal volume needed totitrate the solution was 23.3 mL. What is the molarity of the KMnO4 solution?

Explanation / Answer

MnO4- + 8H+ + 5e--> Mn2+ + 4H2O C2O42- >> 2CO2 +2e- ________________________________________________________ 2MnO4- + 16H+ +5C2O42- >> 2Mn2++ 10CO2 + 8H2O n(Na2C2O4) = m/M = 0.7901/134 =0.005896mol n(C2O42-) =n(Na2C2O4) =0.005896mol n(MnO4- ) = 2/5 x 0.005896 = 0.002359mol n(KMnO4) = n(MnO4- )=0.002359mol c(MnO4- ) =n/v = 0.002359/0.0233 =0.101M Hope this helps!

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