Standard Electrode Potentials

Half-reaction Eo, V F2 + 2e- 2F- 2.87 S2O82- + 2e- 2SO42- 2.01 Co3+ + e- Co2+ 1.82 Au+ + e- Au 1.68 Ce4+ + e- Ce3+ 1.61 Au3+ + 3e- Au 1.50 Cl2 + 2e- 2Cl- 1.36 Br2(aq) + 2e- 2Br- 1.09 2Hg2+ + 2e- Hg22+ 0.92 Ag+ + e- Ag 0.80 Hg22+ + 2e- 2Hg(l) 0.79 Fe3+ + e- Fe2+ 0.77 Hg2SO4(s) + 2e- 2Hg + SO42- 0.62 I3- + 2e- 3I- 0.54 I2+ 2e- 2I- 0.54 Cu+ + e- Cu 0.52 [Fe(CN)6]3- + e- [Fe(CN)6]4- 0.36 Cu2+ + 2e- Cu 0.34 Hg2Cl2(s) + 2e- 2Hg + 2Cl- 0.27 AgCl(s) + e- Ag + Cl- 0.22 Cu2+ + e- Cu+ 0.15 Sn4+ + 2e- Sn2+ 0.15 CuCl + e- Cu + Cl- 0.14 S4O62- + 2e- 2S2O32- 0.09 AgBr(s) + e- Ag + Br- 0.07 Pb2+ + 2e- Pb -0.13

Half-reaction Eo, V Sn2+ + 2e- Sn(white) -0.14 AgI(s) + e- Ag + I- -0.15 Mo3+ + 3e- Mo -0.20 Ni2+ + 2e- Ni -0.25 V3+ + e- V2+ -0.26 Co2+ + 2e- Co -0.28 [Ag(CN)2]- + e- Ag + 2CN- -0.31 Cd2+ + 2e- Cd -0.40 Cr3+ + e- Cr2+ -0.41 Fe2+ + 2e- Fe -0.44 U4+ + e- U3+ -0.61 Cr3+ + 3e- Cr -0.74 Zn2+ + 2e- Zn -0.76 Mn2+ + 2e- Mn -1.18 Zr4+ + 4e- Zr -1.53 Ti2+ + 2e- Ti -1.63 Al3+ + 3e- Al -1.66 Th4+ + 4e- Th -1.90 Mg2+ + 2e- Mg -2.37 Ce3+ + 3e- Ce -2.48 La3+ + 3e- La -2.52 Na+ + e- Na -2.71 Ca2+ + 2e- Ca -2.87 Sr2+ + 2e- Sr -2.89 Ba2+ + 2e- Ba -2.91 Cs+ + e- Cs -2.92 K+ + e- K -2.92 Li+ + e- Li -3.04