Half-Reaction Ag + e = Ag A13+3 e Al Au + e Au = E red 0.7996 -1.706 1.68 Cl2(g) +2 e 2 CI 1.3583 Co + 2e=Co -0.28 Cr +3 e = Cr -0.74 Cu + e = Cu 0.522 Cu2+2 e Cu 0.3402 Fe2+ + 2e=Fe -0.409 Fe3+3 e Fe -0.036 2H+2e H 0.0000... HO2+2 e 2 OH 0.88 H2O2+2 H+2e = 2 HO 1.776 Hg2+2 e=Hg 0.851 Hg2+ + 2e=Hg 0.7961 Ke=K -2.924 Mg2+ + 2e=Mg -2.375 Mn+2 e Mn -1.04 Na + e Na -2.7109 N+ + 2eNi -0.23 O2+2 H2O+4e = 4 OH 0.401 O2+4H+4e2 HO 1.229 O3(g) +2 H+2 e O2(g) + HO 2.07 Pb2+2 ePb -0.1263 PbO2+4H+2 e Pb2+2 HO 1.467 = Pt +2 ePt Sn + 2 e Sn 1.2 -0.1364