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To monitor the quantity of copper metal deposited during electrolysis of copper sulphate solution.
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Aim: To monitor the quantity of copper metal deposited during electrolysis of copper sulphate solution. Introduction: When a solution of copper sulphate is electrolysed using carbon or platinum electrodes, copper is obtained at the cathode and oxygen at the anode. On the other hand when copper electrodes are used instead, something unusual happens. At the cathode: Copper ions become atoms, as you would expect: ( Cu2+ ) + ( 2e- ) ==> Cu The copper atoms cling to the cathode. At the anode: The copper anode dissolves, forming copper ions: Cu ==> ( Cu2+ ) + ( 2e- ) So the anode wears away, while the cathode grows thicker. If you weigh them you will find that: Mass of copper lost by anode = Mass of copper gained by cathode. This electrolysis is used in industry to purify copper, which has to be very pure for use in electrical wires. The impure copper is made into an anode. As it...
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