Standard Potentials at 25°C

v4 : 4-29-13      pdf of this table

Half Reaction   Potential
F2 + 2e−   ⇌   2F− +2.87 V
O3 + 2H+ + 2e−   ⇌   O2 + H2O +2.07 V
S2O82− + 2e−   ⇌   2SO42− +2.05 V
H2O2 + 2H+ + 2e−   ⇌   2H2O +1.78 V
PbO2 + 3H+ + HSO4− + 2e−   ⇌   PbSO4 + 2H2O +1.69 V
Au+ + e−   ⇌   Au +1.69 V
Pb4+ +2e−   ⇌   Pb2+ +1.67 V
2 HClO + 2H+ + 2e−   ⇌   Cl2 + 2H2O +1.63 V
Ce4+ + e−   ⇌   Ce3+ +1.61 V
MnO4− + 8H+ + 5e−   ⇌   Mn2+ + 4H2O +1.51 V
Au3+ + 3e−   ⇌   Au +1.40 V
Cl2 + 2e−   ⇌   2Cl− +1.36 V
Cr2O72− + 14H+ + 6e−   ⇌   2Cr3+ + 7H2O +1.33 V
O2 + 4H+ + 4e−   ⇌   2H2O +1.23 V
MnO2 + 4H+ + 2e−   ⇌   Mn2+ + 2H2O +1.21 V
Pt2+ + 2e−   ⇌   Pt +1.20 V
Br2 + 2e−   ⇌   2Br− +1.09 V
Pd2+ + 2e−   ⇌   Pd +0.915 V
2Hg2+ + 2e−   ⇌   Hg22+ +0.92 V
ClO− + H2O + 2e−   ⇌   Cl− + 2OH− +0.89 V
Ag+ + e−   ⇌   Ag +0.80 V
Hg22+ + 2e−   ⇌   2Hg +0.79 V
Fe3+ + e−   ⇌   Fe2+ +0.77 V
MnO4− + 2H2O + 3e−   ⇌   MnO2 + 4OH− +0.60 V
I2 + 2e−   ⇌   2I− +0.54 V
O2 + 2H2O + 4e−   ⇌   4OH− +0.40 V
Cu2+ + 2e−   ⇌   Cu +0.34 V
Hg2Cl2 + 2e−   ⇌   2Hg + 2Cl− +0.27 V
AgCl + e−   ⇌   Ag + Cl− +0.22 V
Bi3+ + e−   ⇌   Bi +0.20 V
NO3− + H2O + 2e−   ⇌   NO2− + 2OH− +0.01 V
2H+ + 2e−   ⇌   H2 0.000 V
Half Reaction   Potential
2H+ + 2e−   ⇌   H2 0.000 V
Fe3+ + 3e−   ⇌   Fe −0.04 V
Pb2+ + 2e−   ⇌   Pb −0.13 V
Sn2+ + 2e−   ⇌   Sn −0.14 V
Ni2+ + 2e−   ⇌   Ni −0.23 V
V3+ + e−   ⇌   V2+ −0.26 V
Co2+ + 2e−   ⇌   Co −0.28 V
In3+ + 3e−   ⇌   In −0.34 V
PbSO4 + H++ 2e−   ⇌   Pb + HSO4− −0.36 V
Cd2+ + 2e−   ⇌   Cd −0.40 V
Cr3+ + e−   ⇌   Cr2+ −0.41 V
Fe2+ + 2e−   ⇌   Fe −0.44 V
U4+ + e−   ⇌   U3+ −0.61 V
FeCO3 + 2e−   ⇌   Fe + CO32- −0.756 V
Zn2+ + 2e−   ⇌   Zn −0.76 V
2H2O + 2e−   ⇌   H2 + 2OH− −0.83 V
Cr2+ + 2e−   ⇌   Cr −0.91 V
Mn2+ + 2e−   ⇌   Mn −1.18 V
V2+ + 2e−   ⇌   V −1.19 V
ZnS + 2e−   ⇌   Zn + S2− −1.44 V
Al3+ + 3e−   ⇌   Al −1.66 V
Mg2+ + 2e−   ⇌   Mg −2.36 V
Na+ + e−  ⇌  Na −2.71 V
K+ + e−  ⇌  K −2.92 V
Li+ + e−  ⇌  Li −3.05 V
Note: all ions are aqueous (aq), many neutral species are solids (s), although some are liquids (l), gases (g), and even aqueous (aq). Use other sources for details on state. They were purposely left off here to save space and keep a cleaner looking table.