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Cell Voltage - table

The following table lists reduction potentials (in volts) for a variety of reduction half-reactions. When read in reverse (from right to left), one also has a list oxidation potentials.
 

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Cathode (Reduction) Half-ReactionStandard 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


 

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