Standard Electrode Potentials in 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
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
Discussion of Standard Electrode Potentials
Index

Tables

Reference
Ebbing
Appendix I
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