Table of Common Standard Reduction Potentials

Standard Reduction Potentials at STP

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 electrodeStandard 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-reactionReduction Potential - E0 in Volts
Ag+ + e- → Ag0.7996
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 H2O1.36
Cu+ + e- → Cu-3.026
Cu2+ + e- → Cu+0.153
Cu2+ + 2 e- → Cu0.3419
Cu3+ + e- → Cu2+2.4
F2 + 2 H+ + 2 e- → 2 HF3.053
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- → H20.0000
H2O2 + 2 H+ + 2 e- → 2 H2O1.776
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 H2O20.695
O2 + 4 H+ + 4 e- → H2O1.229
Pb2+ + 2 e- → Pb-0.1262
PbSO4 + 2 e- → Pb + SO42--0.3588
Pt2+ + 2 e- → Pt1.18
S + 2 e- → S2--0.4284
S + 2 H+ + 2 e- → H2S0.142
SO42- + H2 + 2 e- → SO32- + 2 OH--0.93
Zn2+ + 2 e- → Zn-0.7618
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Helmenstine, Anne Marie, Ph.D. "Table of Common Standard Reduction Potentials." ThoughtCo, Feb. 9, 2017, thoughtco.com/table-of-common-standard-reduction-potentials-603964. Helmenstine, Anne Marie, Ph.D. (2017, February 9). Table of Common Standard Reduction Potentials. Retrieved from https://www.thoughtco.com/table-of-common-standard-reduction-potentials-603964 Helmenstine, Anne Marie, Ph.D. "Table of Common Standard Reduction Potentials." ThoughtCo. https://www.thoughtco.com/table-of-common-standard-reduction-potentials-603964 (accessed May 23, 2018).