§76 Reversible cell 7. 6. 4 Reversible electrodes The first-type electrode Cu(s) Cu2+(m) metal-metal ion electrode Cu A metal plate immersed in a solution Cult CurCuit +2e containing the corresponding metal ions Cu cu2+ C salt bridge Cu Fe electrode Cu electrode (1)Metal electrode Fe(NO3)2 Cu(NO3)2 (2)amalgam electrode solution solution (3)complex/coordination electrode1) The first-type electrode: metal – metal ion electrode A metal plate immersed in a solution containing the corresponding metal ions. Cu (s) Cu2+ (m) (1) Metal electrode (2) amalgam electrode; (3) complex/coordination electrode; (4) gas electrode. 2 Cu Cu 2e + − + 7.6.4 Reversible electrodes §7.6 Reversible cell