Cu is easily extracted by reduction using C; the ore is heated in a furnace (smelting).
However the Cu produced is impure which does not conduct electricity v.well. This isn't v.useful because a lot of Cu is used to make electrical wiring.
So electrolysis is used to purify it though it is quite expensive, and it produces v. pure Cu, which is a much better conductor.
E- are pulled off Cu atoms at the anode, causing them to go into solution as Cu 2+ ions.
Cu 2+ ions near the cathode gain e- and turn back into Cu atoms.
The impurities are dropped at the anode as a sludge, whilst pure Cu atoms bond to the cathode.
The cathode starts as a thin piece of pure Cu and more pure Cu adds to it.
The electrolyte is Cu(II) sulfate solution containing Cu 2+ ions.
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