1. Education
Send to a Friend via Email
You can opt-out at any time. Please refer to our privacy policy for contact information.

Discuss in my forum

Table of Common Standard Reduction Potentials

Standard Reduction Potentials at STP

By

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

©2014 About.com. All rights reserved.