In the electrolytic refining of copper metal, | vedclass

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(C) In the electrolytic refining of copper,an impure copper rod is used as the anode and a thin strip of pure copper is used as the cathode.When an el

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(C) In the electrolytic refining of copper,an impure copper rod is used as the anode and a thin strip of pure copper is used as the cathode.When an electric current is passed through the electrolyte (acidified copper sulfate solution),the impure copper from the anode dissolves into the solution as $Cu^{2+}$ ions.These $Cu^{2+}$ ions then migrate to the cathode,where they gain electrons and deposit as pure copper metal.As the impure copper anode continuously loses copper atoms to the solution,its weight decreases over time.Conversely,the weight of the pure copper cathode increases as more copper is deposited on it.

In the electrolytic refining of copper metal,which of the following decreases in weight?

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