Appendix D. Standard Electrode (Half-Cell) Potentials

Standard Electrode (Half-Cell) Potentials

Half-Reaction

E° (V)

Age⟶ Ag +0.7996
AgCl e⟶ Ag Cl +0.22233
[Ag(CN)2]− e⟶ Ag CN −0.31
Ag2CrOe− ⟶ Ag CrO42− +0.45
[Ag(NH3)2]e− ⟶ Ag NH3 +0.373
[Ag(S2O3)2]3e− ⟶ Ag 2 S2O32− +0.017
[AlF6]3− e− ⟶ Al F −2.07
Al3+ e− ⟶ Al −1.662
Am3+ e⟶ Am −2.048
Au3+ e− ⟶ Au +1.498
Aue− ⟶ Au +1.692
Ba2+ e− ⟶ Ba −2.912
Be2+ e− ⟶ Be −1.847
Br2(aqe− ⟶ Br +1.0873
Ca2+ e− ⟶ Ca −2.868
Ce3+ e− ⟶ Ce −2.483
Ce4+ e− ⟶ Ce3+ +1.61
Cd2+ e− ⟶ Cd −0.4030
[Cd(CN)4]2− e− ⟶ Cd CN −1.09
[Cd(NH3)4]2+ e− ⟶ Cd NH3 −0.61
CdS e− ⟶ Cd S2− −1.17
Cle− ⟶ Cl +1.35827
ClO4 H2e− ⟶ ClO3− OH +0.36
ClO3− H2e− ⟶ ClO2− OH +0.33
ClO2− H2e− ⟶ ClO− OH +0.66
ClO− H2e− ⟶ Cl− OH +0.89
ClO4− H3Oe− ⟶ ClO3− H2O +1.189
ClO3− H3Oe− ⟶ HClOH2O +1.21
HClO H3Oe− ⟶ Cl− H2O +1.482
HClO H3Oe− ⟶ 1ClH2O +1.611
HClOH3Oe− ⟶ HClO H2O +1.628
Co3+ e− ⟶ Co2+ (2mol//H2SO4) +1.83
Co2+ e− ⟶ Co −0.28
[Co(NH3)6]3+ e− ⟶ [Co(NH3)6]2+ +0.1
Co(OH)e− ⟶ Co(OH)OH +0.17
Cr3e− ⟶ Cr −0.744
Cr3+ e− ⟶ Cr2+ −0.407
Cr2+ e− ⟶ Cr −0.913
[Cu(CN)2]− e− ⟶ Cu CN −0.43
CrO42− H2e− ⟶ Cr(OH)OH −0.13
Cr2O72− 14 H3Oe− ⟶ Cr3+ 21 H2O +1.232
[Cr(OH)4]− e− ⟶ Cr OH −1.2
Cr(OH)e− ⟶ Cr OH −1.48
Cu2+ e− ⟶ Cu+ +0.153
Cu2+ e− ⟶ Cu +0.34
Cue− ⟶ Cu +0.521
Fe− ⟶ F +2.866
Fe2+ e− ⟶ Fe −0.447
Fe3+ e− ⟶ Fe2+ +0.771
[Fe(CN)6]3− e− ⟶ [Fe(CN)6]4− +0.36
Fe(OH)e− ⟶ Fe OH −0.88
FeS e− ⟶ Fe S2− −1.01
Ga3+ e− ⟶ Ga −0.549
Gd3+ e− ⟶ Gd −2.279
1/He− ⟶ H −2.23
H2e− ⟶ HOH −0.8277
H2OH3Oe− ⟶ H2O +1.776
H3Oe− ⟶ HH2O2 0.00
HO2− H2e− ⟶ OH +0.878
Hf4+ e− ⟶ Hf −1.55
Hg2+ e− ⟶ Hg +0.851
Hg2+ e− ⟶ Hg22+ +0.92
Hg22+ e− ⟶ Hg +0.7973
[HgBr4]2− e− ⟶ Hg Br +0.21
Hg2Cle− ⟶ Hg Cl +0.26808
[Hg(CN)4]2− 2 e− ⟶ Hg 4 CN −0.37
[HgI4]2− 2 e− ⟶ Hg 4 I −0.04
HgS 2 e− ⟶ Hg S2− −0.70
I2 e− ⟶ 2 I +0.5355
In3+ 3 e− ⟶ In −0.3382
Ke− ⟶ K −2.931
La3+ 3 e− ⟶ La −2.52
Lie− ⟶ Li −3.04
Lu3+ 3 e− ⟶ Lu −2.28
Mg2+ 2 e− ⟶ Mg −2.372
Mn2+ 2 e− ⟶ Mn −1.185
MnO2 H22 e− ⟶ Mn(OH)2 OH −0.05
MnO4− 2 H23 e− ⟶ MnO4 OH +0.558
MnOHe− ⟶ Mn2+ H2O +1.23
MnO4− He− ⟶ Mn2+ H2O +1.507
Nae− ⟶ Na −2.71
Nd3+ 3 e− ⟶ Nd −2.323
Ni2+ 2 e− ⟶ Ni −0.257
[Ni(NH3)6]2+ 2 e− ⟶ Ni 6 NH3 −0.49
NiOHe− ⟶ Ni2+ H2O +1.593
NiO2 H22 e− ⟶ Ni(OH)2 OH +0.49
NiS 2 e− ⟶ Ni S2− +0.76
NO3− He− ⟶ NO H2O +0.957
NO3− He− ⟶ HNOH2O +0.92
NO3− H22 e− ⟶ NO2− 2 OH +0.10
Np3+ 3 e− ⟶ Np −1.856
O2 H24 e− ⟶ 4 OH +0.401
OHe− ⟶ H2O2 +0.695
OHe− ⟶ H2O +1.229
Pb2+ 2 e− ⟶ Pb −0.1262
PbOSO42− He− ⟶ PbSOH2O +1.69
PbS 2 e− ⟶ Pb S2− −0.95
PbSO2 e− ⟶ Pb SO42− −0.3505
Pd2+ 2 e− ⟶ Pd +0.987
[PdCl4]2− 2 e− ⟶ Pd 4 Cl +0.591
Pt2+ 2 e− ⟶ Pt +1.20
[PtBr4]2− 2 e− ⟶ Pt 4 Br +0.58
[PtCl4]2− 2 e− ⟶ Pt 4 Cl +0.755
[PtCl6]2− 2 e− ⟶ [PtCl4]2− 2 Cl +0.68
Pu33 e− ⟶ Pu −2.03
Ra2+ 2 e− ⟶ Ra −2.92
Rbe− ⟶ Rb −2.98
[RhCl6]3− 3 e− ⟶ Rh 6 Cl +0.44
2 e− ⟶ S2− −0.47627
He− ⟶ H2S +0.142
Sc3+ 3 e− ⟶ Sc −2.09
Se He− ⟶ H2Se −0.399
[SiF6]2− 4 e− ⟶ Si 6 F −1.2
SiO32− 3 H24 e− ⟶ Si 6 OH −1.697
SiOHe− ⟶ Si H2O −0.86
Sm3+ 3 e− ⟶ Sm −2.304
Sn4+ 2 e− ⟶ Sn2+ +0.151
Sn2+ 2 e− ⟶ Sn −0.1375
[SnF6]2− 4 e− ⟶ Sn 6 F −0.25
SnS 2 e− ⟶ Sn S2− −0.94
Sr2+ 2 e− ⟶ Sr −2.89
TeOHe− ⟶ Te H2O +0.593
Th4+ 4 e− ⟶ Th −1.90
Ti2+ 2 e− ⟶ Ti −1.630
U3+ 3 e− ⟶ U −1.79
V2+ 2 e− ⟶ V −1.19
Y3+ 3 e− ⟶ Y −2.37
Zn2+ 2 e− ⟶ Zn −0.7618
[Zn(CN)4]2− 2 e− ⟶ Zn 4 CN −1.26
[Zn(NH3)4]2+ 2 e− ⟶ Zn 4 NH3 −1.04
Zn(OH)2 e− ⟶ Zn 2 OH −1.245
[Zn(OH)4]2+ + 2 e− ⟶ Zn 4 OH −1.199
ZnS 2 e− ⟶ Zn S2− −1.40
Zr44 e− ⟶ Zr −1.539

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