Table of Standard Reduction Potentials

Submitted by ChemPRIME Staff on Thu, 12/09/2010 - 14:26

Standard ReductionThat part of a chemical reaction in which a reactant gains electrons; simultaneous oxidation of a reactant must occur. Potentials in AqueousDescribing a solution in which the solvent is water. SolutionA mixture of one or more substances dissolved in a solvent to give a homogeneous mixture. at 25 °C


Acidic Solution Standard Reduction Potential, E° (volts)
F2(g) + 2e → 2F (aq)
2.87
Co3+(aq) + e → Co2+(aq)
1.92
Au+(aq) + e → Au(s)
1.83
H2O2(aq) + 2H3O+(aq) + 2e → 4H2O(ℓ)
1.763
Ce4+(aq) + e → Ce3+(aq)
1.72
Pb4+(aq) + 2e → Pb2+(aq)
1.69
PbO2(s) + SO42−(aq) + 4H3O+(aq) + 2e → PbSO4(s) + 6H2O(ℓ)
1.690
NiO2(s) + 4H3O+(aq) + 2e → Ni2+(aq) + 6H2O(ℓ)
1.68
2HClO(aq) + 2H3O+(aq) + 2e → Cl2(g) + 4H2O(ℓ)
1.63
Au3+(aq) + 3e → Au(s)
1.52
MnO4(aq) + 8H3O+(aq) + 5e → Mn2+(aq) + 12H2O(ℓ)
1.51
BrO3(aq) + 6H3O+(aq) + 5e → ½Br2(aq) + 9H2O(ℓ)
1.478
2ClO3(aq) + 12H3O+(aq) + 10e → Cl2(g) + 18H2O(ℓ)
1.47
Cr2O72−(aq) + 14H3O+(aq) + 6e → 2Cr3+(aq) + 21H2O(ℓ)
1.36
Cl2(g) + 2e → 2Cl(aq)
1.358
N2H5+(aq) + 3H3O+(aq) + 2e → 2NH4+(aq) + 3H2O(ℓ)
1.275
MnO2(s) + 4H3O+(aq) + 2e → Mn2+(aq) + 6H2O(ℓ)
1.23
O2(g) + 4H3O+(aq) + 4e → 6H2O(ℓ)
1.229
ClO4(aq) + 2H3O+(aq) + 2e → ClO3(aq) + 3H2O(ℓ)
1.201
IO3(aq) + 6H3O+(aq) + 5e → ½ I2(aq) + 9H2O(ℓ)
1.195
Pt2+(aq) + 2e → Pt(s)
1.188
Br2(ℓ) + 2e → 2Br(aq)
1.066
AuCl4(aq) + 3e → Au(s) + 4Cl(aq)
1.00
NO3(aq) + 4H3O+(aq) + 3e → NO(g) + 6H2O(ℓ)
0.96
NO3(aq) + 3H3O+(aq) + 2e → HNO2(aq) + 4H2O(ℓ)
0.94
Pd2+(aq) + 2e → Pd(s)
0.915
2Hg2+(aq) +2e → Hg22+(aq)
0.9110
Hg2+(aq) +2e → Hg(ℓ)
0.8535
SbCl6(aq) + 2e → SbCl4(aq) + 2Cl(aq)
0.84
Ag+(aq) + e → Ag(s)
0.7991
Hg22+(aq) + 2e → 2Hg(ℓ)
0.7960
Fe3+(aq) + e → Fe2+(aq)
0.771
[PtCl4] 2−(aq) + 2e → Pt(s) + 4Cl(aq)  
0.758
[PtCl6] 2−(aq) + 2e → [PtCl4] 2−(aq) + 2Cl(aq)  
0.726
O2(g) + 2H3O+(aq) + 2e → H2O2(aq) + 2H2O(ℓ)
0.695
TeO2(s) + 4H3O+(aq) + 4e → Te(s) + 6H2O(ℓ)
0.604
H3AsO4(aq) + 2H3O+(aq) + 2e → HAsO2(aq) + 4H2O(ℓ)
0.560
I2(s) + 2e → 2I(aq)
0.535
Cu+(aq) + e → Cu(s)
0.521
[RhCl6] 3−(aq) + 3e → Rh(s) + 6Cl(aq)  
0.5
Cu2+(aq) + 2e → Cu(s)
0.340
Hg2Cl2(s) + 2e → 2Hg(ℓ) + 2Cl(aq)
0.27
AgCl(s) + e → Ag(s) + Cl(aq)
0.222
Cu2+(aq) + e → Cu+(aq)
0.159
SO42−(aq) + 4H3O+(aq) + 2e → H2SO3(aq) + 5H2O(ℓ)
0.158
Sn4+(aq) + 2e → Sn2+(aq)
0.15
S(s) + 2H3O+(aq) + 2e → H2S(aq) + 2H2O(ℓ)
0.144
AgBr(s) + e → Ag(s) + Br(aq)
0.0713
2H3O+(aq) + 2e → 2H2(g) + 2H2O(ℓ) (reference electrode)
0.0000
N2O(g) + 6H3O+(aq) + 4e → 2NH3OH+(aq) + 5H2O(ℓ)
– 0.05
HgS(s, black) + 2H3O+(aq) + 2e → Hg(ℓ) + H2S(g) + 2H2O(ℓ)
– 0.085
Se(s) + 2H3O+(aq) + 2e → H2Se(aq) + 2H2O(ℓ)
– 0.115
Pb2+(aq) + 2e → Pb(s)
– 0.125
Sn2+(aq) + 2e → Sn(s)
– 0.1375
AgI(s) + e → Ag(s) + I(aq)
– 0.1522
[SnF6]2–(aq) + 4e → Sn(s) + 6F(aq)
– 0.200
Ni2+(aq) + 2e → Ni(s)
– 0.25
Co2+(aq) + 2e → Co(s)
-0.277
Tl+(aq) + e → Tl(s)
– 0.3363
PbSO4(s) + 2e → Pb(s) + SO42−(aq)
– 0.3505
Cd2+(aq) + 2e → Cd(s)
– 0.403
Cr3+(aq) + e → Cr2+(aq)
– 0.424
Fe2+(aq) + 2e → Fe(s) 
– 0.44
2CO2(g) + 2H3O+(aq) + 2e → (COOH)2(aq) + 2H2O(ℓ)
– 0.481
Ga3+(aq) + 3e → Ga(s)
– 0.53
Cr3+(aq) + 3e → Cr(s)
– 0.74
Zn2+(aq) + 2e → Zn(s)
– 0.763
Cr2+(aq) + 2e → Cr(s)
– 0.90
V2+(aq) + 2e → V(s)
– 1.13
Mn2+(aq) + 2e → Mn(s)
– 1.18
Zr4+(aq) + 4e → Zr(s)
– 1.55
Al3+(aq) + 3e → Al(s)
– 1.676
H2(g) + 2e → 2H(aq)
– 2.25
Mg2+(aq) + 2e → Mg(s)
– 2.356
Na+(aq) + e → Na(s)
- 2.714
Ca2+(aq) + 2e → Ca(s)
– 2.84
Sr2+(aq) + 2e → Sr(s)
– 2.89
Ba2+(aq) + 2e → Ba(s)
– 2.92
Rb+(aq) + e → Rb(s)
– 2.925
K+(aq) + e → K(s) 
– 2.925
Li+(aq) + e → Li(s) 
– 3.045


Standard Reduction Potentials in Basic Solution at 25 °C


Basic Solution Standard Reduction Potential, E° (volts)
ClO(aq) + H2O(ℓ) + 2e → Cl(aq) + 2OH(aq)
0.89
OOH(aq) + H2O(ℓ) + 2e → 3OH(aq)
0.867
2NH2OH(aq) + 2e → N2H4(aq) + 2OH(aq)
0.73
ClO3(aq) + 3H2O(ℓ) + 6e → Cl(aq) + 6OH(aq)
0.622
ClO3(aq) + 3H2O(ℓ) + 6e → Cl(aq) + 6OH(aq)
0.622
MnO4(aq) + 2H2O(ℓ) + 3e → MnO2(s) + 4OH(aq)
0.60
MnO4(aq) + e → MnO42–(aq)
0.56
NiO2(s) + 2H2O(ℓ) + 2e → Ni(OH)2(s) + 2OH(aq)
0.49
Ag2CrO4(s) + 2e → 2Ag(s) + CrO42–(aq)
0.4491
O2(g) + 2H2O(ℓ) + 4e → 4OH(aq)
0.401
ClO4(aq) + H2O(ℓ) + 2e → ClO3(aq) + 2OH(aq)
0.374
Ag2O(s) + H2O(ℓ) + 2e → 2Ag(s) + 2OH(aq)
0.342
2NO2(aq) + 3H2O(ℓ) + 4e → N2O(g) + 6OH(aq)
0.15
[Co(NH3)6]3+(aq) + e → [Co(NH3)6]3+(aq)
0.058
HgO(s) + H2O(ℓ) + 2e → Hg(ℓ) + 2OH(aq)
0.0977
O2(g) + H2O(ℓ) + 2e → OOH(aq) + OH(aq)
0.0649
NO3(aq) + H2O(ℓ) + 2e → NO2(aq) + 2OH(aq)
0.01
MnO2(s) + 2H2O(ℓ) + 2e → Mn(OH)2(s) + 2OH(aq)
-0.05
CrO42–(aq) + 4H2O(ℓ) + 3e → Cr(OH)3(s) + 5OH(aq)
-0.11
Cu2O(s) + H2O(ℓ) + 2e → 2Cu(s) + 2OH(aq)
-0.365
FeO2(aq) + H2O(ℓ) + 2e → HFeO2(aq) + OH(aq)
-0.69
2H2O(ℓ) + 2e → H2(g) + 2OH(aq)
-0.8277
2NO3(aq) + 2H2O(ℓ) + 2e → N2O4(g) + 4OH(aq)
-0.86
HFeO2(aq) + 2e → Fe(s) + 3OH(aq)
-0.8
SO42–(aq) + H2O(ℓ) + 2e → SO32–(aq) + 2OH(aq)
-0.936
N2(g) + 4H2O(ℓ) + 4e → N2H4(aq) + 4OH(aq)
-1.16
[Zn(OH)4]2–(aq) + 2e → Zn(s) + 4OH(aq)
-1.285
Zn(OH)2(s) + 2e → Zn(s) + 2OH(aq)
-1.246
[Zn(CN)4]2–(aq) + 2e → Zn(s) + 4CN(aq)
-1.34
Cr(OH)3(s) + 3e → Cr(s) + 3OH(aq)
-1.33
SiO32–(aq) + 3H2O(ℓ) + 4e → Si(s) + 6OH(aq)
-1.69
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