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0.10 g of a sample containing CuCO(3) an...

0.10 g of a sample containing `CuCO_(3)` and some inert impurity was dissolved in dilute sulphuric acid and volume made up to 520 mL. This solution was added into 50mL of 0.04 M KI solution where copper precipitates as Cul and `I^(-)` is oxidized into `I_(3)^(-)`. A 10 mL portion of this solution is taken for analysis, filtered and made up free `I_(3)^(-)` and then treated with excess of acidic permanganate solution. Liberated iodine required 20 mL of 2.5 mM sodium thiosulphate solution to reach the end point.
Determine mass percentage of `CuCO_(3)` in the original sample.

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