JAMB - Chemistry (2008 - No. 24)
In recharging a lead-acid accumulator, the reaction at the cathode can be represented as
Pb2+(aq) + SO2-4(aq) →PbSO4(s)
Pb2+(aq) + 2e- →Pb(s)
Pb2+(aq) + 2H2O(l) → PbO2(s) + 4H+(aq) + 4e-
Pb(s) → Pb2+(aq) + 2e-
Forklaring
In lead acid ,lead dissociates at the cathode Pb2+(aq) + 2e- →Pb(s)