A 0.276 g impure sample of copper ore is dissolved and `Cu^(2+)` is titrated with KI solution. `I_(2)` liberated required 40 mL

A 0.276 g impure sample of copper ore is dissolved and `Cu^(2+)` is titrated with KI solution. `I_(2)` liberated required 40 mL of 0.1 M `Na_(2)` `S_(2)` `O_(3)` solution for titration. What is the % of impurities in the ore ?

A 0.276 g impure sample of copper ore is dissolved and `Cu^(2+)` is titrated with KI solution. `I_(2)` liberated required 40 mL of 0.1 M `Na_(2)` `S_(

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