Cathode = Cu2(s) + 2e- �¨ Cu(s)

Anode = 2H2O(l) �¨ O2(g) + 4H(g) + 4e-
Net = Cu2(s) + 2H2O(l) �¨ Cu(s) + O2(g) + 4H(g)
the minimum voltage that must be supplied to electrolyze aqueous copper(II) sulfate