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Question

An impure sample of sodium oxalate (Na2C2O4) weighing 0.20g is dissolved in aqueous solution of H2SO4 and solution is titrated at 70C, requiring 45mL of 0.02MKMnO4 solution. The end point is overrun and back titration in carried out with 10mL of 0.1M oxalic acid solution. Find the % purity of Na2C2O4 in sample.

A
75
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B
83.75
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C
90.25
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D
None of these
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Solution

The correct option is D 83.75
Meq. of Na2C2O4 = Meq. of KMnO4 reacted
Total Meq. of KMnO4excess Meq. of KMnO4 reacted with H2C2O4=45×0.02×510×0.1×2=2.5.
1000×W134×2=2.5
WNa2C2O4=0.1675g.
% purity of Na2C2O4 in sample=0.16750.2×100=83.75.

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