Table of Common Standard Reduction Potentials

This table is an alphabetical listing of common reduction half-reactions and their standard reduction potential, E0, at 25 C, and 1 atmosphere of pressure.The standard reduction potentials are all based on the standard hydrogen electrode.  Standard oxidation potentials can be calculated by reversing the half-reactions and changing the sign of the standard reduction potential.E0REDUCTION - E0OXIDATION Reduction Half-Reaction Reduction Potential - E0 in Volts Ag+ + e- Ag 0.7996 Ag2+ + e- Ag+ 1.980 Ag3+ + e- Ag2+ 1.8 AgBr + e- Ag + Br- 0.0713 AgCl + e- Ag + Cl- 0.2223 AgF + e- Ag + F- 0.779 AgI + e- Ag + I- -0.1522 AgNO2 + e- Ag + 2 NO2- 0.564 Ag2S + 2 e- 2 Ag + S2- -0.691 Ag2S + 2 H+ + 2 e- 2 Ag + H2S -0.0366 Al3+ + 3 e- Al -1.662 Br2(aq) +2 e- 2 Br- 1.0873 Br2() +2 e- 2 Br- 1.066 Ca2+ + 2 e- Ca -2.868 Cd2+ + 2 e- Cd -0.4030 Cl2 + 2 e- 2 Cl-(g) 1.3583 Cr2+ + 2 e- Cr -0.913 Cr3+ + e- Cr2+ -0.407 Cr3+ + 3 e- Cr -0.744 Cr2O72- + 14 H+ + 6 e- 2 Cr3+ + 7 H2O 1.36 Cu+ + e- Cu -3.026 Cu2+ + e- Cu+ 0.153 Cu2+ + 2 e- Cu 0.3419 Cu3+ + e- Cu2+ 2.4 F2 + 2 H+ + 2 e- 2 HF 3.053 F2 + 2 e- 2 F- 2.866 Fe2+ + 2 e- Fe -0.447 Fe3+ + 3 e- Fe -0.037 Fe3+ + e- Fe2+ 0.771 2 H+ + 2 e- H2 0.0000 H2O2 + 2 H+ + 2 e- 2 H2O 1.776 I2 + 2 e- 2 I- 0.5355 K+ + e- K -2.931 Li+ + e- Li -3.0401 Mg+ + e- Mg -2.70 Mg2+ + 2 e- Mg -2.372 Mn2+ + 2 e- Mn -1.185 Mn3+ + e- Mn2+ 1.5415 Na+ + e- Na -2.71 Ni2+ + 2 e- Ni -0.257 O2 + 2 H+ + 2 e- 2 H2O2 0.695 O2 + 4 H+ + 4 e- H2O 1.229 Pb2+ + 2 e- Pb -0.1262 PbSO4 + 2 e- Pb + SO42- -0.3588 Pt2+ + 2 e- Pt 1.18 S + 2 e- S2- -0.4284 S + 2 H+ + 2 e- H2S 0.142 SO42- + H2 + 2 e- SO32- + 2 OH- -0.93 Zn2+ + 2 e- Zn -0.7618 Reference: Handbook of Chemistry and Physics, 89th Edition, CRC Press 2008