Chemistry: Oxidation-Reduction

Standard Electrode Potentials for 1.0 M Aqueous Solution at 25°C

Cathode (Reduction)
Half-Reaction

Standard Potential
E° (volts)

Li+(aq) + e- → Li(s) -3.04
K+(aq) + e- → K(s) -2.92
Ca2+(aq) + 2e- → Ca(s) -2.76
Na+(aq) + e- → Na(s) -2.71
Mg2+(aq) + 2e- → Mg(s) -2.38
Al3+(aq) + 3e- → Al(s) -1.66
2H2O(l) + 2e- → H2(g) + 2OH-(aq) -0.83
Zn2+(aq) + 2e- → Zn(s) -0.76
Cr3+(aq) + 3e- → Cr(s) -0.74
Fe2+(aq) + 2e- → Fe(s) -0.41
Cd2+(aq) + 2e- → Cd(s) -0.40
Ni2+(aq) + 2e- → Ni(s) -0.23
Sn2+(aq) + 2e- → Sn(s) -0.14
Pb2+(aq) + 2e → Pb(s) -0.13
Fe3+(aq) + 3e- → Fe(s) -0.04
2H+(aq) + 2e- → H2(g) 0.00
Sn4+(aq) + 2e- → Sn2+(aq) 0.15
Cu2+(aq) + e- → Cu+(aq) 0.16
ClO4-(aq) + H2O(l) + 2e- → ClO3-(aq) + 2OH-(aq) 0.17
AgCl(s) + e- → Ag(s) + Cl-(aq) 0.22
Cu2+(aq) + 2e- → Cu(s) 0.34
ClO3-(aq) + H2O(l) + 2e- → ClO2-(aq) + 2OH-(aq) 0.35
IO-(aq) + H2O(l) + 2e- → I-(aq) + 2OH-(aq) 0.49
Cu+(aq) + e- → Cu(s) 0.52
I2(s) + 2e- → 2I-(aq) 0.54
ClO2-(aq) + H2O(l) + 2e- → ClO-(aq) + 2OH-(aq) 0.59
Fe3+(aq) + e- → Fe2+(aq) 0.77
Hg22+(aq) + 2e- → 2Hg(l) 0.80
Ag+(aq) + e- → Ag(s) 0.80
Hg2+(aq) + 2e- → Hg(l) 0.85
ClO-(aq) + H2O(l) + 2e- → Cl-(aq) + 2OH-(aq) 0.90
2Hg2+(aq) + 2e- → Hg22+(aq) 0.90
NO3-(aq) + 4H+(aq) + 3e- → NO(g) + 2H2O(l) 0.96
Br2(l) + 2e- → 2Br-(aq) 1.07
O2(g) + 4H+(aq) + 4e- → 2H2O(l) 1.23
MnO2(g) + 4H+(aq) + 2e- → Mn2+ + 2H2O(l) 1.23
Cr2O72-(aq) + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(l) 1.33
Cl2(g) + 2e- → 2Cl-(aq) 1.36
Ce4+(aq) + e- → Ce3+(aq) 1.44
MnO4-(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l) 1.49
H2O2(aq) + 2H+(aq) + 2e- → 2H2O(l) 1.78
Co3+(aq) + e- → Co2+(aq) 1.82
S2O82-(aq) + 2e- → 2SO42-(aq) 2.01
O3(g) + 2H+(aq) + 2e- → O2(g) + H2O(l) 2.07
F2(g) + 2e- → 2F-(aq) 2.87