Appendix L – Standard Electrode (Half-Cell) Potentials
Appendix L
Standard Electrode (Half-Cell) Potentials
Standard Electrode (Half-Cell) Potentials
|
Half-Reaction |
E° (V) |
|
Ag+ + e− ⟶ Ag |
+0.7996 |
|
AgCl + e− ⟶ Ag + Cl− |
+0.22233 |
|
[Ag(CN)2]− + e− ⟶ Ag + 2CN− |
−0.31 |
|
Ag2CrO4 + 2e− ⟶ 2Ag + CrO42− |
+0.45 |
|
[Ag(NH3)2]+ + e− ⟶ Ag + 2NH3 |
+0.373 |
|
[Ag(S2O3)2]3+ + e− ⟶ Ag + 2S2O32− |
+0.017 |
|
[AlF6]3− + 3e− ⟶ Al + 6F− |
−2.07 |
|
Al3+ + 3e− ⟶ Al |
−1.662 |
|
Am3+ + 3e− ⟶ Am |
−2.048 |
|
Au3+ + 3e− ⟶ Au |
+1.498 |
|
Au+ + e− ⟶ Au |
+1.692 |
|
Ba2+ + 2e− ⟶ Ba |
−2.912 |
|
Be2+ + 2e− ⟶ Be |
−1.847 |
|
Br2(aq) + 2e− ⟶ 2Br− |
+1.0873 |
|
Ca2+ + 2e− ⟶ Ca |
−2.868 |
|
Ce3 + 3e− ⟶ Ce |
−2.483 |
|
Ce4+ + e− ⟶ Ce3+ |
+1.61 |
|
Cd2+ + 2e− ⟶ Cd |
−0.4030 |
|
[Cd(NH)4]2− + 2e− ⟶ Cd + 4CN− |
−1.09 |
|
[Cd(NH3)4]2+ + 2e− ⟶ Cd + 4NH3 |
−0.61 |
|
CdS + 2e− ⟶ Cd + S2− |
−1.17 |
|
Cl2 + 2e− ⟶ 2Cl− |
+1.35827 |
|
ClO4 − + H2O + 2e− ⟶ ClO3 − + 2OH− |
+0.36 |
|
ClO3 − + H2O + 2e− ⟶ ClO2 − + 2OH− |
+0.33 |
|
ClO2 − + H2O + 2e− ⟶ ClO− + 2OH− |
+0.66 |
|
ClO− + H2O + 2e− ⟶ Cl− + 2OH− |
+0.89 |
|
ClO4− + 2H3O+ + 2e− ⟶ ClO3 − + 3H2O |
+1.189 |
|
ClO3− + 3H3O+ + 2e− ⟶ HClO2 + 4H2O |
+1.21 |
|
HClO + H3O+ + 2e− ⟶ Cl− + 2H2O |
+1.482 |
|
HClO + H3O+ + e− ⟶ [latex]\frac{1}{2}[/latex]Cl2 + 2H2O |
+1.611 |
|
HClO2 + 2H3 O+ + 2e− ⟶ HClO + 3H2O |
+1.628 |
|
Co3+ + e− ⟶ Co2+ (2 mol // H2SO4) |
+1.83 |
|
Co2+ + 2e− ⟶ Co |
−0.28 |
|
[Co(NH3)6]3+ + e– ⟶ [Co(NH3)6]2+ |
+0.1 |
|
Co(OH)3 + e− ⟶ Co(OH)2 + OH− |
+0.17 |
|
Cr3 + 3e− ⟶ Cr |
−0.744 |
|
Cr3+ + e− ⟶ Cr2+ |
−0.407 |
|
Cr2+ + 2e− ⟶ Cr |
−0.913 |
|
[Cu(CN)2]− + e− ⟶ Cu + 2CN− |
−0.43 |
|
CrO4 2− + 4H2O + 3e− ⟶Cr(OH)3 + 5OH− |
−0.13 |
|
Cr2O7 2− + 14H3O+ + 6e− ⟶ 2Cr3+ + 21H2O |
+1.232 |
|
[Cr(OH)4]− + 3e− ⟶ Cr + 4OH− |
−1.2 |
|
Cr(OH)3 + 3e− ⟶ Cr + 3OH− |
−1.48 |
|
Cu2+ + e− ⟶ Cu+ |
+0.153 |
|
Cu2+ + 2e− ⟶ Cu |
+0.34 |
|
Cu+ + e− ⟶ Cu |
+0.521 |
|
F2 + 2e− ⟶ 2F− |
+2.866 |
|
Fe2+ + 2e− ⟶ Fe |
−0.447 |
|
Fe3+ + e− ⟶ Fe2+ |
+0.771 |
|
[Fe(CN)6]3- + e– ⟶[Fe(CN)6]4- |
+0.36 |
|
Fe(OH)2 + 2e− ⟶ Fe + 2OH− |
−0.88 |
|
FeS + 2e− ⟶ Fe + S2− |
−1.01 |
|
Ga3+ + 3e− ⟶ Ga |
−0.549 |
|
Gd3+ + 3e− ⟶ Gd |
−2.279 |
| [latex]\frac{1}{2}[/latex]H2 + e- ⟶ H- |
−2.23 |
|
2H2O + 2e− ⟶ H2 + 2OH− |
−0.8277 |
|
H2O2 + 2H3O+ + 2e− ⟶ 4H2O |
+1.776 |
|
2H3O+ + 2e− ⟶ H2 + 2H2O |
0.00 |
|
HO2− + H2O + 2e− ⟶ 3OH− |
+0.878 |
|
Hf4+ + 4e− ⟶ Hf |
−1.55 |
|
Hg2+ + 2e− ⟶ Hg |
+0.851 |
|
2Hg2+ + 2e− ⟶ Hg2 2+ |
+0.92 |
|
Hg2 2+ + 2e− ⟶ 2Hg |
+0.7973 |
|
[HgBr4]2− + 2e− ⟶ Hg + 4Br− |
+0.21 |
|
Hg2 Cl2 + 2e− ⟶ 2Hg + 2Cl− |
+0.26808 |
|
[Hg(CN)4]2− + 2e− ⟶ Hg + 4CN− |
−0.37 |
|
[HgI4]2− + 2e− ⟶ Hg + 4I− |
−0.04 |
|
HgS + 2e− ⟶ Hg + S2− |
−0.70 |
|
I2 + 2e− ⟶ 2I− |
+0.5355 |
|
In3+ + 3e− ⟶ In |
−0.3382 |
|
K+ + e− ⟶ K |
−2.931 |
|
La3+ + 3e− ⟶ La |
−2.52 |
|
Li+ + e− ⟶ Li |
−3.04 |
|
Lu3+ + 3e− ⟶ Lu |
−2.28 |
|
Mg2+ + 2e− ⟶ Mg |
−2.372 |
|
Mn2+ + 2e− ⟶ Mn |
−1.185 |
|
MnO2 + 2H2O + 2e− ⟶ Mn(OH)2 + 2OH− |
−0.05 |
|
MnO4 − + 2H2O + 3e− ⟶ MnO2 + 4OH− |
+0.558 |
|
MnO2 + 4H+ + 2e− ⟶Mn2+ + 2H2O |
+1.23 |
|
MnO4 − + 8H+ + 5e− ⟶Mn2+ + 4H2O |
+1.507 |
|
Na+ + e− ⟶ Na |
−2.71 |
|
Nd3+ + 3e− ⟶ Nd |
−2.323 |
|
Ni2+ + 2e− ⟶ Ni |
−0.257 |
|
[Ni(NH3)6]2+ + 2e− ⟶ Ni + 6NH3 |
−0.49 |
|
NiO2 + 4H+ + 2e− ⟶Ni2+ + 2H2O |
+1.593 |
|
NiO2 + 2H2O + 2e− ⟶ Ni(OH)2 + 2OH− |
+0.49 |
|
NiS + 2e− ⟶ Ni + S2− |
+0.76 |
|
NO3 − + 4H+ + 3e− ⟶NO + 2H2O |
+0.957 |
|
NO3 − + 3H+ + 2e− ⟶HNO2 + H2O |
+0.92 |
|
NO3 − + H2O + 2e− ⟶ NO2 − + 2OH− |
+0.10 |
|
Np3+ + 3e− ⟶ Np |
−1.856 |
|
O2 + 2H2O + 4e− ⟶ 4OH− |
+0.401 |
|
O2 + 2H+ + 2e− ⟶H2O2 |
+0.695 |
|
O2 + 4H+ + 4e− ⟶ 2H2O |
+1.229 |
|
Pb2+ + 2e− ⟶ Pb |
−0.1262 |
|
PbO2 + SO4 2− + 4H+ + 2e− ⟶PbSO4 + 2H2O |
+1.69 |
|
PbS + 2e− ⟶ Pb + S2− |
−0.95 |
|
PbSO4 + 2e− ⟶ Pb + SO4 2− |
−0.3505 |
|
Pd2+ + 2e− ⟶ Pd |
+0.987 |
|
[PdCl4]2− + 2e− ⟶ Pd + 4Cl− |
+0.591 |
|
Pt2+ + 2e− ⟶ Pt |
+1.20 |
|
[PtBr4]2− + 2e− ⟶ Pt + 4Br− |
+0.58 |
|
[PtCl6]2− + 2e− ⟶ Pt + 4Cl− |
+0.755 |
|
[PtCl6]2− + 2e− ⟶ ⎡PtCl ⎤2− + 2Cl− |
+0.68 |
|
Pu3 + 3e− ⟶ Pu |
−2.03 |
|
Ra2+ + 2e− ⟶ Ra |
−2.92 |
|
Rb+ + e− ⟶ Rb |
−2.98 |
|
[RhCl6]3− + 3e− ⟶ Rh + 6Cl− |
+0.44 |
|
S + 2e− ⟶ S2− |
−0.47627 |
|
S + 2H+ + 2e− ⟶H2S |
+0.142 |
|
Sc3+ + 3e− ⟶ Sc |
−2.09 |
|
Se + 2H+ + 2e− ⟶H2 Se |
−0.399 |
|
[SiF6]2− + 4e− ⟶ Si + 6F− |
−1.2 |
|
SiO3 2− + 3H2O + 4e− ⟶ Si + 6OH− |
−1.697 |
|
SiO2 + 4H+ + 4e− ⟶Si + 2H2O |
−0.86 |
|
Sm3+ + 3e− ⟶ Sm |
−2.304 |
|
Sn4+ + 2e− ⟶ Sn2+ |
+0.151 |
|
Sn2+ + 2e− ⟶ Sn |
−0.1375 |
|
[SnF6]2− + 4e− ⟶ Sn + 6F− |
−0.25 |
|
SnS + 2e− ⟶ Sn + S2− |
−0.94 |
|
Sr2+ + 2e− ⟶ Sr |
−2.89 |
|
TeO2 + 4H+ + 4e− ⟶Te + 2H2O |
+0.593 |
|
Th4+ + 4e− ⟶ Th |
−1.90 |
|
Ti2+ + 2e− ⟶ Ti |
−1.630 |
|
U3+ + 3e− ⟶ U |
−1.79 |
|
V2+ + 2e− ⟶ V |
−1.19 |
|
Y3+ + 3e− ⟶ Y |
−2.37 |
|
Zn2+ + 2e− ⟶ Zn |
−0.7618 |
|
[Zn(CN)4]2− + 2e− ⟶ Zn + 4CN− |
−1.26 |
|
[Zn(NH3)4]2+ + 2e− ⟶ Zn + 4NH3 |
−1.04 |
|
Zn(OH)2 + 2e− ⟶ Zn + 2OH− |
−1.245 |
|
[Zn(OH)4]2 + 2e− ⟶ Zn + 4OH− |
−1.199 |
|
ZnS + 2e− ⟶ Zn + S2− |
−1.40 |
|
Zr4 + 4e− ⟶ Zr |
−1.539 |
Table L1
