How impure copper can purified using electrolysis?
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How impure copper can purified using electrolysis watch
- Thread Starter
- 12-04-2016 19:28
- 12-04-2016 20:23
Copper can be extracted from its ore by heating it with carbon. Impure copper is purified by electrolysis in which the anode is impure copper, the cathode is pure copper and the electrolyte is copper sulphate solution.
Copper is less reactive than carbon, so it can be extracted from its ores by heating it with carbon. For example, copper is formed if copper oxide is heated strongly with charcoal, which is mostly carbon:
copper(II) oxide + carbon → copper + carbon dioxide
2CuO + C → 2Cu + CO2
Removing oxygen from a substance is called reduction. The copper oxide is reduced to copper in the reaction above.
Copper is purified by electrolysis. Electricity is passed through solutions containing copper compounds, such as copper(II) sulphate. Pure copper forms on the negative electrode.