Table of Common Standard Reduction Potentials

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Updated on January 10, 2020

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.
E⁰_REDUCTION = - E⁰_OXIDATION

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 + S^2-	-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
Cr₂O₇^2- + 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 + SO₄^2-	-0.3588
Pt²⁺ + 2 e^- → Pt	1.18
S + 2 e^- → S^2-	-0.4284
S + 2 H⁺ + 2 e^- → H₂S	0.142
SO₄^2- + H₂ + 2 e^- → SO₃^2- + 2 OH^-	-0.93
Zn²⁺ + 2 e^- → Zn	-0.7618

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

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Helmenstine, Anne Marie, Ph.D. "Table of Common Standard Reduction Potentials." ThoughtCo, Aug. 27, 2020, thoughtco.com/table-of-common-standard-reduction-potentials-603964. Helmenstine, Anne Marie, Ph.D. (2020, August 27). 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 29, 2023).