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Table of Common Standard Reduction Potentials

Standard Reduction Potentials at STP

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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

Reference: Handbook of Chemistry and Physics, 89th Edition, CRC Press 2008

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(ℓ) +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

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