Chemistry · May / June 2023 · Paper 12 · Question 12

Aqueous copper(II) sulfate is electrolysed using copper electrodes. The current is constant and the anode is weighed at regular time intervals. Which graph is obtained when the mass of the anode is plotted against time?

1. Agraph: mass of anode decreasing rapidly then levelling off against time
2. Bgraph: mass of anode increasing linearly from a non-zero value against time
3. Cgraph: mass of anode decreasing linearly from a non-zero value against time
4. Dgraph: mass of anode increasing linearly from zero against time

As printed in the paper