[SOLVED] Electrolysis, coating 2. Relevant equation Why electrolysis of aqueous zinc sulfate is not used for coating with zinc metal? 3. The attempt at a solution The following reaction has more positive electrode potential: (SO4)2- + 4H+ + 2e => H2SO3 + H2O than the reaction 2H+ + 2e- => H2(g); so H2SO3 would form at cathode. However, the right answer is that H+(aq) discharged preferentially because cations in solution =H+(aq),Zn2+(aq). Do you know why? Thank you in advance!