A substance of crude copper is boiled in H_(2)SO_(4) till all the copper has reacted. The impurites are inert to acid. The SO_(2) liberated in the reactionis passed into 100mL of 0.4M acidified KMnO_(3). The solution of KMnO_(4)after passage of SO_(2) is allowed to react withoxalic acid and requireds 23.6mL of 1.2M oxalic acid. IF the purity of copper is 90% what was the weight of sample?

A substance of crude copper is boiled in H_(2)SO_(4) till all the copp

1.	A substance of crude copper is boiled in H_(2)SO_(4) till all the copper has reacted. The impurites are inert to acid. The SO_(2) liberated in the reactionis passed into 100mL of 0.4M acidified KMnO_(3). The solution of KMnO_(4)after passage of SO_(2) is allowed to react withoxalic acid and requireds 23.6mL of 1.2M oxalic acid. IF the purity of copper is 90% what was the weight of sample?
Answer» ANSWER :`5.06g`