The calcium contained in a solution of 1.048 g of a substance being analysed was…
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Problem
The calcium contained in a solution of 1.048 g of a substance being analysed was precipitated with 25 mL H2C2O4 . The excess of C2O42− in one fourth of filtrate
was back titrated with 5 mL of 0.1025 N KMnO4 . To determine the conc. of H2C2O4 solution, it was diluted four folds and titration of 25 mL of dilute solution used up 24.1 mL of same KMnO4 solution. Calculate % of Ca in substance.