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A 5.0 g sample containing Pb 3 O 4 , PbO 2 and some inert impurity is dissolved in 250 mL dil. HNO 3 solution and 2.7 g of Na 2 C 2 O 4 was added so that all lead converted to Pb 2+ . A 10 mL portion of this solution required 8.0 mL 0.02 M KMnO 4 for titration of excess of oxalate. In an another experiment 25 mL of solution was taken and excess oxalate was removed by extraction, this required 10 mL of a permanganate solution for oxidation of Pb 2+ to Pb 4+ . 10 mL of this permanganate solution is equivalent to 4.48 mL 5 V H 2 O 2 solution. Calculate mass % of PbO 2 and Pb 3 O 4 in the original sample. [Atomic mass of Pb = 207]

A 5.0 g sample containing Pb3O4, PbO2 and some inert impurity is dissolved in 250 mL dil. HNO3 solution and 2.7 g of Na2C2O4 was added so that all lead converted to Pb2+. A 10 mL portion of this solution required 8.0 mL 0.02 M KMnO4 for titration of excess of oxalate. In an another experiment 25 mL of solution was taken and excess oxalate was removed by extraction, this required 10 mL of a permanganate solution for oxidation of Pb2+ to Pb4+. 10 mL of this permanganate solution is equivalent to 4.48 mL 5 V H2O2 solution. Calculate mass % of PbO2 and Pb3O4 in the original sample.


[Atomic mass of Pb = 207]


 

Grade:11

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