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Standard Reduction Potentials at 25oC*

Half-Reaction
E0 (V)
Li+(aq) + e- -----> Li(s)-3.05
K+(aq) + e- -----> K(s)-2.93
Ba2+(aq) + 2 e- -----> Ba(s)-2.90
Sr2+(aq) + 2 e- -----> Sr(s)-2.89
Ca2+(aq) + 2 e- -----> Ca(s)-2.87
Na+(aq) + e- -----> Na(s)-2.71
Mg2+(aq) + 2 e- -----> Mg(s)-2.37
Be2+(aq) + 2 e- -----> Be(s)-1.85
Al3+(aq) + 3 e- -----> Al(s)-1.66
Mn2+(aq) + 2 e- -----> Mn(s)-1.18
2 H2O + 2 e- -----> H2(g) + 2 OH-(aq)-0.83
Zn2+(aq) + 2 e- -----> Zn(s)-0.76
Cr3+(aq) + 3 e- -----> Cr(s)-0.74
Fe2+(aq) + 2 e- -----> Fe(s)-0.44
Cd2+(aq) + 2 e- -----> Cd(s)-0.40
PbSO4(s) + 2 e- -----> Pb(s) + SO42-(aq) -0.31
Co2+(aq) + 2 e- -----> Co(s)-0.28
Ni2+(aq) + 2 e- -----> Ni(s)-0.25
Sn2+(aq) + 2 e- -----> Sn(s)-0.14
Pb2+(aq) + 2 e- -----> Pb(s)-0.13
2 H+(aq) + 2 e- -----> H2(g)0.00
Sn4+(aq) + 2 e- -----> Sn2+(aq)+0.13
Cu2+(aq) + e- -----> Cu+(aq)+0.13
SO42-(aq) + 4 H+(aq) + 2 e- -----> SO2(g) + 2 H2O+0.20
AgCl(s) + e- -----> Ag(s) + Cl-(aq)+0.22
Cu2+(aq) + 2 e- -----> Cu(s)+0.34
O2(g) + 2 H2 + 4 e- -----> 4 OH-(aq)+0.40
I2(s) + 2 e- -----> 2 I-(aq)+0.53
MnO4-(aq) + 2 H2O + 3 e- -----> MnO2(s) + 4 OH-(aq)+0.59
O2(g) + 2 H+(aq) + 2 e- -----> H2O2(aq)+0.68
Fe3+(aq) + e- -----> Fe2+(aq)+0.77
Ag+(aq) + e- -----> Ag(s)+0.80
Hg22+(aq) + 2 e- -----> 2 Hg(l)+0.85
2 Hg2+(aq) + 2 e- -----> Hg22+(aq)+0.92
NO3-(aq) + 4 H+(aq) + 3 e- -----> NO(g) + 2 H2O+0.96
Br2(l) + 2 e- -----> 2 Br-(aq)+1.07
O2(g) + 4 H+(aq) + 4 e- -----> 2 H2O+1.23
MnO2(s) + 4 H+(aq) + 2 e- -----> Mn2+(aq) + 2 H2O+1.23
Cr2O72-(aq) + 14 H+(aq) + 6 e- -----> 2 Cr3+(aq) + 7 H2O+1.33
Cl2(g) + 2 e- -----> 2 Cl-(aq)+1.36
Au3+(aq) + 3 e- -----> Au(s)+1.50
MnO4-(aq) + 8 H+(aq) + 5 e- -----> Mn2+(aq) + 4 H2O+1.51
Ce4+(aq) + e- -----> Ce3+(aq)+1.61
PbO2(s) + 4 H+(aq) + SO42-(aq) + 2 e- -----> PbSO4(s) + 2 H2O+1.70
H2O2(aq) + 2 H+(aq) + 2 e- -----> 2 H2O+1.77
Co3+(aq) + e- -----> Co2+(aq)+1.82
O3(g) + 2 H+(aq) + 2 e- -----> O2(g) + H2O+2.07
F2(g) + 2 e- -----> F-(aq)+2.87
*For all half-reactions the concentration is 1M for dissolved species and the pressure is 1 atm for gases. These are standard state values.