Essential Chemistry for IGCSE - Electricity And Chemistry (Section 8 - No. 19)
What happens to the impurities during the refining of copper?
They are deposited on the cathode.
They dissolve in the electrolyte.
They form a sludge (anode mud) at the bottom of the cell.
They react with the copper ions to form new compounds.
Explanation
Impurities accumulate at the bottom of the electrolytic cell as anode mud.
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