1. Calculate the emf of a cell made up of iron and lead electrodes in a solution of Fe2+ and Pb2+ of equal activity. Which electrode tends to corrode when the cell is short - circuited?

2. Given Fe2+ + 2e- → Fe, φo = −0.440 V, and Fe3+ + e- → Fe2+ , φo = 0.771 V, calculate φo for Fe3+ + 3e- → Fe.