Essential Chemistry for IGCSE - Electricity And Chemistry (Section 7 - No. 6)

Which of the following reactions occurs at the anode during the electrolysis of copper sulfate solution using copper electrodes?

Cu2+ + 2e- -> Cu

Cu -> Cu2+ + 2e-

2H+ + 2e- -> H2

4OH- -> O2 + 2H2O + 4e-

At the anode, copper atoms lose electrons (oxidation) to form Cu2+ ions, which then dissolve in the solution.