Standard Reduction Potentials

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Standard Cathode (Reduction) Half-Reaction Standard Reduction Potential E° (volts)
Li+(aq) + e ⇌ Li(s) –3.040
Ba2+ + 2e⇌ Ba(s) –2.92
Rb+ + e ⇌ Rb (s) -2.98
K+(aq) + e ⇌ K(s) -2.93
Cs+(aq) + e ⇌ Cs(s) -2.92
Ba2+(aq) + 2e- ⇌ Ba(s) -2.91
Sr2+(aq) + 2e- ⇌ Sr(s) -2.89
Ca2+(aq) + 2e- ⇌ Ca(s) –2.84
Na+(aq) + e ⇌ Na(s) –2.713
Mg(OH)2(s) + 2e⇌ Mg(s) + 2OH –2.687
La3+ + 3e⇌ La(s) –2.38
Mg2+(aq) + 2e ⇌ Mg(s) -2.356
Ce3+ + 3e⇌ Ce(s) –2.336
Al(OH)4 + 3e⇌ Al(s) + 4OH –2.310
AlF63− + 3e⇌ Al(s) + 6F –2.07
Be2+ + 2e⇌ Be(s) –1.99
B(OH)4 + 3e⇌ B(s) + 4OH –1.811
U3+ + 3e⇌ U(s) –1.66
Al3+(aq) + 3e ⇌ Al(s) –1.676
SiF62− + 4e⇌ Si(s) + 6F –1.37
Zn(CN)42− + 2e⇌ Zn(s) + 4CN –1.34
Zn(OH)42− + 2e⇌ Zn(s) + 4OH –1.285
Mn2+ + 2e⇌ Mn(s) –1.17
V2+ + 2e⇌ V(s) –1.13
2SO32− + 2H2O(l) + 2e− ⇌ S2O42− + 4OH –1.13
Zn(NH3)42+ + 2e− ⇌ Zn(s) + 4NH3 –1.04
O2 (aq) + e ⇌ O2(aq) -1
Cd(CN)42− + 2e⇌ Cd(s) + 4CN –0.943
MoO42− + 4H2O(l) + 6e⇌Mo(s) + 8OH –0.913
SiO2(s) + 4H+ + 4e⇌ Si(s) + 2H2O(l) –0.909
SO42− + H2O(l) + 2e ⇌ SO32−+ 2OH –0.936
Cr2+ + 2e− ⇌ Cr(s) –0.90
B(OH)3 + 3H+ + 3e− ⇌ B(s) + 3H2O(l) –0.890
2H2O(l) + 2e ⇌ H2(g) + 2OH(aq) -0.828
Zn2+(aq) + 2e ⇌ Zn(s) –0.7618
Co(OH)2(s) + 2e⇌ Co(s) + 2OH –0.746
Cr3+(aq) + 3e ⇌ Cr(s) –0.424
Ni(OH)2 + 2e⇌ Ni(s) + 2OH –0.72
Ag2S(s) + 2e⇌ 2Ag(s) + S2− –0.71
Se(s) + 2e⇌ Se2− –0.67 in 1 M NaOH
Cd(NH3)42+ + 2e⇌ Cd(s) + 4NH3 –0.622
2SO32− + 3H2O(l) + 4e− ⇌S2O32− + 6OH –0.576 in 1 M NaOH
U4+ + e− ⇌ U3+ –0.52
SiO2(s) + 8H+ + 8e− ⇌ SiH4(g) + 2H2O(l) –0.516
Sb + 3H+ + 3e− ⇌ SbH3(g) –0.510
H3PO3+ 2H+ + 2e− ⇌ H3PO2 + H2O(l) -0.5
Ni(NH3)62+ + 2e− ⇌ Ni(s) + 6NH3 –0.49
2CO2(g) + 2H+ +2e⇌ H2C2O4 –0.481
Cr3+ + e⇌ Cr2+ –0.424
Fe2+(aq) + 2e ⇌ Fe(s) -0.44
S(s) + 2e⇌ S2− –0.407
Cd2+(aq) + 2e ⇌ Cd(s) –0.4030
Ag(NH3)2+ + e⇌ Ag(s) + 2NH3 –0.373
Ti3+ + e⇌ Ti2+ –0.37
PbSO4(s) + 2e⇌ Pb(s) + SO42− –0.356
Co2+(aq) + 2e ⇌ Co(s) –0.277
2SO42− + 4H+ + 2e− ⇌ S2O62− + 2H2O(l) –0.25
N2(g) + 5H+ + 4e⇌ N2H5+ –0.23
H3PO4 + 2H+ + 2e⇌ H3PO3 + H2O(l) -0.28
Ni2+(aq) + 2e ⇌ Ni(s) –0.257
V3+ + e− ⇌ V2+ –0.255
As + 3H+ + 3e− ⇌ AsH3(g) –0.225
CO2(g) + 2H+ + 2e− ⇌ HCO2H –0.20
Mo3+ + 3e− ⇌ Mo(s) –0.2
Sn2+ + 2e− ⇌ Sn(s) –0.19 in 1 M HCl
Ti2+ + 2e⇌ Ti(s) –0.163
MoO2(s) + 4H+ + 4e⇌ Mo(s) + 2H2O(l) –0.152
AgI(s) + e− ⇌ Ag(s) + I –0.152
Sn2+(aq) + 2e ⇌ Sn(s) -0.14
Pb2+(aq) + 2e ⇌ Pb(s) -0.126
CrO42− + 4H2O(l) + 3e− ⇌2Cr(OH)4 + 4OH –0.13 in 1 M NaOH
WO2(s) + 4H+ + 4e⇌ W(s) + 2H2O(l) –0.119
Se(s) + 2H+ + 2e⇌ H2Se(g) –0.115
CO2(g) + 2H+ + 2e⇌ CO(g) + H2O(l) –0.106
WO3(s) + 6H+ + 6e⇌ W(s) + 3H2O(l) –0.090
Hg2I2(s) + 2e⇌ 2Hg(l) + 2I –0.0405
Fe3+(aq) + 3e ⇌ Fe(s) -0.037
2H+(aq) + 2e ⇌ H2(g) 0
P(s,white) + 3H+ + 3e⇌ PH3(g) 0.06
AgBr(s) + e⇌ Ag(s) + Br 0.071
S4O62− + 2e⇌2S2O32− 0.08
Co(NH3)63+ +e⇌Co(NH3)62+ 0.1
Ru(NH3)63+ + e⇌ Ru(s) + Ru(NH3)62+ 0.1
S(s) + 2H+ + 2e⇌ H2S 0.144
Sn4+(aq) + 2e ⇌ Sn2+(aq) 0.154
Cu2+(aq) + e ⇌ Cu+(aq) 0.159
UO22+ + e− ⇌UO2+ 0.16
Co(OH)3(s) + e⇌ Co(OH)2(s) + OH 0.17
ClO4(aq) + H2O(l) + 2e- ⇌ ClO3(aq) + 2OH(aq) 0.17
SO42− + 4H+ + 2e− ⇌ H2SO32−+ H2O(l) 0.172
BiCl4 + 3e⇌ Bi(s) + 4Cl 0.199
SbO+ + 2H+ + 3e⇌ Sb(s) + H2O(l) 0.212
AgCl(s) + e ⇌ Ag(s) + Cl(aq) 0.2223
HCHO + 2H+ + 2e⇌ CH3OH 0.2323
HAsO2 + 3H+ + 3e⇌ As(s) + 2H2O(l) 0.24
Ru3+ + e⇌ Ru2+ 0.249
IO3+ 3H2O(l) + 6e⇌ I + 6OH 0.257
Hg2Cl2(s) + 2e⇌ 2Hg(l) + 2Cl 0.2682
UO2+ + 4H+ + e− ⇌U4+ + 2H2O(l) 0.27
Bi3+ + 3e⇌ Bi(s) 0.317
UO22+ + 4H+ + 2e− ⇌ U4+ + 2H2O(l) 0.327
VO2+ + 2H+ +e⇌V3+ + H2O(l) 0.337
Cu2+(aq) + 2e ⇌ Cu(s) 0.3419
ClO3(aq) + H2O(l) + 2e ⇌ ClO2(aq) + 2OH(aq) 0.35
Fe(CN)63− + e− ⇌ Fe(CN)64− 0.356
O2(g) + 2H2O(l) + 4e⇌ 4OH 0.401
ClO + H2O(l) + e− ⇌ ½Cl2(g) + 2OH 0.421 in 1 M NaOH
 Ag2C2O4(s) + 2e⇌ 2Ag(s) + C2O42− 0.47
Cu+(aq) + e ⇌ Cu(s) 0.52
I2(s) + 2e ⇌ 2I(aq) 0.5355
I3 + 2e⇌ 3I 0.536
Ga3+ + 3e⇌ Ga(s) -0.56
Cu2+ + Cl + e⇌ CuCl(s) 0.559
S2O62− + 4H+ + 2e⇌ 2H2SO3 0.569
H3AsO4 + 2H+ + 2e⇌ HAsO2 + 2H2O(l) 0.56
ClO2(aq) + H2O(l) + 2e ⇌ ClO(aq) + 2OH(aq) 0.59
MnO4 + 2H2O(l) + 3e⇌ MnO2(s) + 4OH 0.6
Sb2O5(s) + 6H+ + 4e⇌ 2SbO+ + 3H2O(l) 0.605
PtCl62− + 2e⇌ PtCl42- + 2Cl 0.68
RuO2(s) + 4H+ + 4e⇌ Ru(s) + 2H2O(l) 0.68
O2(g) + 2H+ + 2e⇌ H2O2 0.695
PtCl42− + 2e⇌ Pt(s) + 4Cl 0.73
H2SeO3 + 4H+ + 4e⇌ Se(s) + 3H2O(l) 0.74
Tl3+ + 3e⇌ Tl(s) 0.742
Fe3+(aq) + e ⇌ Fe2+(aq) 0.771
Hg22+(aq) + 2e ⇌ 2Hg(l) 0.796
Ag+(aq) + e- ⇌ Ag(s) 0.7996
Hg2+(aq) + 2e ⇌ Hg(l) 0.8535
Cu2+ + I +e⇌ CuI(s) 0.86
Ru(CN)63− +e⇌ Ru(s) + Ru(CN)64− 0.86
ClO + H2O(l) + 2e⇌ Cl + 2OH 0.890 in 1 M NaOH
2Hg2+(aq) + 2e ⇌ Hg22+(aq) 0.911
HgO(s) + 2H+ + 2e⇌ Hg(l) + H2O(l) 0.926
NO3 + 3H+ + 2e⇌ HNO2 + H2O(l) 0.94
MnO2(s) + 4H+ + e ⇌ Mn3+ (aq) + H2O(I) 0.95
NO3(aq) + 4H+(aq) + 3e ⇌ NO(g) + 2H2O(l) 0.96
HIO + H+ + 2e⇌ I + H2O(l) 0.985
HNO2 + H+ +e⇌ NO(g) + H2O(l) 0.996
VO22+ + 2H+  +e⇌ VO2+ + H2O(l) 1
AuCl4 + 3e⇌ Au(s) + 4Cl 1.002
NO2 (g) + H+ (aq) + e ⇌ HNO2 (aq) 1.07
Br2(l) + 2e ⇌ 2Br(aq) 1.087
Fe(phen)63+ +e− ⇌ Fe(phen)62+ 1.147
SeO43− + 4H+ + e⇌ H2SeO3 + H2O(l) 1.151
ClO3 + 2H+ + e⇌ ClO2(g) + H2O 1.175
ClO3 + 3H+ + 2e− ⇌ HClO2 + H2O 1.181
IO3 + 6H+ + 5e⇌ ½I2(s) + 3H2O(l) 1.195
Pt2+ + 2e⇌ Pt(s) 1.2
ClO4 + 2H+ + 2e− ⇌ ClO3 + H2O 1.201
O2(g) + 4H+(aq) + 4e ⇌ 2H2O(l) 1.229
MnO2(s) + 4H+ + 2e⇌ Mn2+ + 2H2O(l) 1.23
Tl3+ + 2e− ⇌ Tl+ 0.77 in 1 M HCl
2HNO2 + 4H+ + 4e⇌ N2O(g) + 3H2O(l) 1.297
HOBr + H+ + 2e⇌ Br + H2O(l) 1.341
Cr2O72-(aq) + 14H+(aq) + 6e ⇌ 2Cr3+(aq) + 7H2O(l) 1.36
Cr2O72− + 14H+ + 6e− ⇌ 2Cr3+ + 7H2O(l) 1.36
Cl2(g) + 2e ⇌ 2Cl(aq) 1.396
Au3+ + 2e⇌ Au+ 1.36
Hg2Br2(s) + 2e⇌ 2Hg(l) + 2Br 1.392
Ce4+(aq) + e ⇌ Ce3+(aq) 1.44
PbO2(s) + 4H+ +2e ⇌ Pb2+(aq) + 2H2O(l) 1.46
BrO3 + 6H+ + 6e⇌ Br + 3H2O 1.478
Mn3+ + e⇌ Mn2+ 1.5
MnO4(aq) + 8H+(aq) + 5e ⇌ Mn2+(aq) + 4H2O(l) 1.51
BrO3 + 6H+ + 5e⇌ ½Br2(l) + 3H2O 1.5
Au3+ + 3e⇌ Au(s) 1.52
2NO(g) + 2H+ + 2e⇌ N2O(g) + H2O(l) 1.59
HOBr + H+ + e⇌ ½Br + H2O(l) 1.604
HClO2 + 2H+ + 2e⇌ HOCl + H2O 1.64
PbO2(s) + 4SO42− + 4H+ + 2e⇌ PbSO4(s) + 2H2O(l) 1.69
MnO4 + 4H+ +3e⇌ MnO2(s) + 2H2O(l) 1.7
Ce4+ + e⇌ Ce3+ 1.72
N2O(g) + 2H+ + 2e⇌ N2(g) + H2O(l) 1.77
H2O2(aq) + 2H+(aq) + 2e ⇌ 2H2O(l) 1.763
Au+ + e⇌ Au(s) 1.83
Co3+(aq) + e ⇌ Co2+(aq) 1.92
S2O82− + 2e⇌2SO42− 1.96
O3(g) + 2H+(aq) + 2e ⇌ O2(g) + H2O(l) 2.07
BaO(s) + 2H+ + 2e⇌ Ba(s) + H2O(l) 2.365
F2(g) + 2e ⇌ 2F(aq) 2.87
F2(g) + 2H+ + 2e⇌ 2HF 3.053
Aluminum E° (V)
Al3+ + 3e ⇌ Al(s) –1.676
Al(OH)4 + 3e ⇌ Al(s) + 4OH –2.310
AlF63− + 3e ⇌ Al(s) + 6F –2.07
Antimony
Sb + 3H+ + 3e ⇌ SbH3(g) –0.510
Sb2O5(s) + 6H+ + 4e ⇌ 2SbO+ + 3H2O(l) 0.605
SbO+ + 2H+ + 3e ⇌ Sb(s) + H2O(l) 0.212
Arsenic
As + 3H+ + 3e ⇌ AsH3(g) –0.225
H3AsO4 + 2H+ + 2e ⇌ HAsO2 + 2H2O(l) 0.56
HAsO2 + 3H+ + 3e ⇌ As(s) + 2H2O(l) 0.24
Barium
Ba2+ + 2e ⇌ Ba(s) –2.91
BaO(s) + 2H+ + 2e⇌ Ba(s) + H2O(l) 2.365
Beryllium
Be2+ + 2e ⇌ Be(s) –1.99
Bismuth
Bi3+ + 3e ⇌ Bi(s) 0.317
BiCl4 + 3e ⇌ Bi(s) + 4Cl 0.199
Boron
B(OH)3 + 3H+ + 3e ⇌ B(s) + 3H2O(l) –0.890
B(OH)4 + 3e ⇌ B(s) + 4OH –1.811
Bromine
Br2 + 2e ⇌ 2Br 1.087
HOBr + H+ + 2e ⇌ Br + H2O(l) 1.341
HOBr + H+ + e ⇌ ½Br + H2O(l) 1.604
BrO + H2O(l) +2e ⇌ Br + 2OH 0.76 in 1 M NaOH
BrO3 + 6H+ + 5e ⇌ ½Br2(l) + 3H2O 1.5
BrO3 + 6H+ + 6e ⇌Br + 3H2O 1.478
Cadmium
Cd2+ + 2e ⇌ Cd(s) –0.4030
Cd(CN)42− + 2e ⇌ Cd(s) + 4CN –0.943
Cd(NH3)42+ + 2e ⇌ Cd(s) + 4NH3 –0.622
Calcium
Ca2+ + 2e ⇌ Ca(s) –2.84
Carbon
CO2(g) + 2H+ + 2e ⇌ CO(g) + H2O(l) –0.106
CO2(g) + 2H+ + 2e ⇌ HCO2H –0.20
2CO2(g) + 2H+ +2e ⇌ H2C2O4 –0.481
HCHO + 2H+ + 2e ⇌ CH3OH 0.2323
Cerium
Ce3+ + 3e ⇌ Ce(s) –2.336
Ce4+ + e ⇌ Ce3+ 1.44
Cesium
Cs+(aq)+e−⇌Cs(s) -2.92
Chlorine
Cl2(g) + 2e−  ⇌ 2Cl 1.396
ClO + H2O(l) + e− ⇌½Cl2(g) + 2OH 0.421 in 1 M NaOH
ClO + H2O(l) + 2e ⇌ Cl + 2OH 0.890 in 1 M NaOH
HClO2 + 2H+ + 2e ⇌ HOCl + H2O 1.64
ClO3 + 2H+ + e ⇌ ClO2(g) + H2O 1.175
ClO3 + 3H+ + 2e⇌HClO2 + H2O 1.181
ClO4 + 2H+ + 2e⇌ ClO3 + H2O 1.201
ClO4(aq) + H2O(l) + 2e- ⇌ ClO3(aq) + 2OH(aq) 0.17
ClO3(aq) + H2O(l) + 2e ⇌ ClO2(aq) + 2OH(aq) 0.35
ClO2(aq) + H2O(l) + 2e ⇌ ClO(aq) + 2OH(aq) 0.59
Chromium
Cr3+ + e ⇌ Cr2+ –0.424
Cr2+ + 2e ⇌ Cr(s) –0.90
Cr2O72− + 14H+ + 6e⇌ 2Cr3+ + 7H2O(l) 1.36
CrO42− + 4H2O(l) + 3e⇌2Cr(OH)4 + 4OH –0.13 in 1 M NaOH
Cobalt
Co2+ + 2e ⇌ Co(s) –0.277
Co3+ + e ⇌ Co2+ 1.92
Co(NH3)63+ +e  ⇌ Co(NH3)62+ 0.1
Co(OH)3(s) + e ⇌ Co(OH)2(s) + OH 0.17
Co(OH)2(s) + 2e ⇌ Co(s) + 2OH –0.746
Copper
Cu+ + e ⇌ Cu(s) 0.52
Cu2+ + e ⇌ Cu+ 0.159
Cu2+ + 2e ⇌ Cu(s) 0.3419
Cu2+ + I +e ⇌ CuI(s) 0.86
Cu2+ + Cl + e ⇌ CuCl(s) 0.559
Fluorine
F2(g) + 2H+ + 2e ⇌ 2HF 3.053
F2(g) + 2e ⇌ 2F 2.87
Gallium
Ga3++3e−⇌Ga(s) -0.56
Gold
Au+ + e ⇌ Au(s) 1.83
Au3+ + 2e ⇌ Au+ 1.36
Au3+ + 3e ⇌ Au(s) 1.52
AuCl4 + 3e ⇌ Au(s) + 4Cl 1.002
Hydrogen
2H++2e−⇌H2(g) 0
H2O + e ⇌ ½H2(g) + OH –0.828
Iodine
I2(s)+2e−⇌2I− 0.5355
I3 + 2e ⇌ 3I 0.536
HIO + H+ + 2e ⇌ I + H2O(l) 0.985
IO3 + 6H+ + 5e ⇌ ½I2(s) + 3H2O(l) 1.195
IO3+ 3H2O(l) + 6e ⇌ I + 6OH 0.257
Iron
Fe2+ + 2e ⇌ Fe(s) –0.44
Fe3+ + 3e ⇌ Fe(s) –0.037
Fe3+ + e ⇌ Fe2+ 0.771
Fe(CN)63− + e⇌ Fe(CN)64− 0.356
Fe(phen)63+ +e⇌Fe(phen)62+ 1.147
Lanthanum
La3+ + 3e ⇌ La(s) –2.38
Lead
Pb2+ + 2e ⇌ Pb(s) –0.126
PbO2(s) + 4H+ +2e ⇌ Pb2+(aq) + 2H2O(l) 1.46
PbO2(s) + 4SO42− + 4H+ + 2e ⇌ PbSO4(s) + 2H2O(l) 1.69
PbSO4(s) + 2e ⇌ Pb(s) + SO42− –0.356
Lithium
Li+ + e ⇌ Li(s) –3.040
Magnesium
Mg2+ + 2e ⇌ Mg(s) –2.356
Mg(OH)2(s) + 2e ⇌ Mg(s) + 2OH –2.687
Manganese
Mn2+ + 2e ⇌ Mn(s) –1.17
Mn3+ + e ⇌ Mn2+ 1.5
MnO2(s) + 4H+ + 2e ⇌ Mn2+ + 2H2O(l) 1.23
MnO2(s) + 4H+ + e ⇌ Mn3+ (aq) + H2O(I) 0.95
MnO4 + 4H+ +3e ⇌ MnO2(s) + 2H2O(l) 1.7
MnO4+ 8H+ + 5e ⇌ Mn2+ + 4H2O(l) 1.51
MnO4 + 2H2O(l) + 3e ⇌ MnO2(s) + 4OH 0.6
Mercury
Hg2+ + 2e ⇌ Hg(l) 0.8535
2Hg2+ + 2e ⇌ Hg22+ 0.911
Hg22+ + 2e ⇌ 2Hg(l) 0.796
Hg2Cl2(s) + 2e ⇌ 2Hg(l) + 2Cl 0.2682
HgO(s) + 2H+ + 2e ⇌ Hg(l) + H2O(l) 0.926
Hg2Br2(s) + 2e ⇌ 2Hg(l) + 2Br 1.392
Hg2I2(s) + 2e ⇌ 2Hg(l) + 2I –0.0405
Molybdenum
Mo3+ + 3e ⇌ Mo(s) –0.2
MoO2(s) + 4H+ + 4e ⇌ Mo(s) + 2H2O(l) –0.152
MoO42− + 4H2O(l) + 6e ⇌Mo(s) + 8OH –0.913
Nickel
Ni2+ + 2e ⇌ Ni(s) –0.257
Ni(OH)2 + 2e ⇌ Ni(s) + 2OH –0.72
Ni(NH3)62+ + 2e ⇌ Ni(s) + 6NH3 –0.49
Nitrogen
N2(g)+5H++4e−⇌N2H+5 –0.23
N2O(g) + 2H+ + 2e ⇌ N2(g) + H2O(l) 1.77
2NO(g) + 2H+ + 2e ⇌ N2O(g) + H2O(l) 1.59
HNO2 + H+ +e ⇌ NO(g) + H2O(l) 0.996
2HNO2 + 4H+ + 4e ⇌ N2O(g) + 3H2O(l) 1.297
NO3 + 3H+ + 2e ⇌ HNO2 + H2O(l) 0.94
NO2(g)+H+(aq)+e−⇌HNO2(aq) 1.07
NO3(aq) + 4H+(aq) + 3e ⇌ NO(g) + 2H2O(l) 0.96
Oxygen
O2(g)+2H++2e−⇌H2O2 0.695
O2(g) + 4H+ + 4e ⇌ 2H2O(l) 1.229
H2O2 + 2H+ + 2e ⇌ 2H2O(l) 1.763
O2(g) + 2H2O(l) + 4e ⇌ 4OH 0.401
O3(g) + 2H+ + 2e ⇌ O2(g) + H2O(l) 2.07
O2 (g) + e ⇌ O2(aq) -0.33
O2 (aq) + e ⇌ O2(aq) -0.16
Phosphorous
P(s,white)+3H++3e−⇌PH3(g) 0.06
H3PO3+ 2H+ + 2e ⇌ H3PO2 + H2O(l) -0.5
H3PO4 + 2H+ + 2e ⇌ H3PO3 + H2O(l) -0.28
Platinum
Pt2+ + 2e ⇌ Pt(s) 1.2
PtCl42− + 2e ⇌ Pt(s) + 4Cl 0.73
PtCl62− + 2e ⇌ PtCl42- + 2Cl 0.68
Potassium
K+ + e ⇌ K(s) -2.93
Rubidium
Rb+ + e ⇌ Rb (s) -2.98
Ruthenium
Ru3+ + e ⇌ Ru2+ 0.249
RuO2(s) + 4H+ + 4e ⇌ Ru(s) + 2H2O(l) 0.68
Ru(NH3)63+ + e ⇌ Ru(s) + Ru(NH3)62+ 0.1
Ru(CN)63− +e ⇌ Ru(s) + Ru(CN)64− 0.86
Selenium
Se(s)+2e−⇌Se2− –0.67 in 1 M NaOH
Se(s) + 2H+ + 2e ⇌ H2Se(g) –0.115
H2SeO3 + 4H+ + 4e ⇌ Se(s) + 3H2O(l) 0.74
SeO43− + 4H+ + e ⇌ H2SeO3 + H2O(l) 1.151
Silicon
SiF2−6+4e−⇌Si(s)+6F− –1.37
SiO2(s) + 4H+ + 4e ⇌ Si(s) + 2H2O(l) –0.909
SiO2(s) + 8H+ + 8e ⇌ SiH4(g) + 2H2O(l) –0.516
Silver
Ag+ + e ⇌ Ag(s) 0.7996
AgBr(s) + e ⇌ Ag(s) + Br 0.071
 Ag2C2O4(s) + 2e ⇌ 2Ag(s) + C2O42− 0.47
AgCl(s) + e ⇌ Ag(s) + Cl 0.2223
AgI(s) + e ⇌ Ag(s) + I –0.152
Ag2S(s) + 2e ⇌ 2Ag(s) + S2− –0.71
Ag(NH3)2+ + e ⇌ Ag(s) + 2NH3 –0.373
Sodium
Na++e−⇌Na(s) –2.713
Strontium
Sr2++2e−⇌Sr(s) –2.89
Sulfur
S(s)+2e−⇌S2− –0.407
S(s) + 2H+ + 2e ⇌ H2S 0.144
S2O62− + 4H+ + 2e ⇌ 2H2SO3 0.569
S2O82− + 2e ⇌2SO42− 1.96
S4O62− + 2e ⇌2S2O32− 0.08
2SO32− + 2H2O(l) + 2e⇌ S2O42− + 4OH –1.13
2SO32− + 3H2O(l) + 4e⇌S2O32− + 6OH
2SO42− + 4H+ + 2e⇌ S2O62− + 2H2O(l) –0.25
SO42− + H2O(l) + 2e⇌ SO32−+ 2OH –0.936
SO42− + 4H+ + 2e⇌ H2SO32−+ H2O(l) 0.172
Thallium
Tl3++2e−⇌Tl+ 0.77 in 1 M HCl
Tl3+ + 3e ⇌ Tl(s) 0.742
Tin
Sn2+ + 2e⇌ Sn(s) -0.14
Sn4+ + 2e ⇌ Sn2+ 0.154
Titanium
Ti2++2e−⇌Ti(s) –0.163
Ti3+ + e ⇌ Ti2+ –0.37
Tungsten
WO2(s)+4H++4e−⇌W(s)+2H2O(l) –0.119
WO3(s) + 6H+ + 6e ⇌ W(s) + 3H2O(l) –0.090
Uranium
U3+ + 3e ⇌ U(s) –1.66
U4+ + e ⇌ U3+ –0.52
UO2+ + 4H+ + e⇌U4+ + 2H2O(l) 0.27
UO22+ + e⇌UO2+ 0.16
UO22+ + 4H+ + 2e⇌ U4+ + 2H2O(l) 0.327
Vanadium
V2++2e−⇌V(s) –1.13
V3+ + e ⇌ V2+ –0.255
VO2+ + 2H+ +e ⇌V3+ + H2O(l) 0.337
VO22+ + 2H+  +e ⇌ VO2+ + H2O(l) 1
Zinc
Zn2+(aq) + 2e− ⇌ Zn(s) –0.7618
Zn(OH)42− + 2e ⇌ Zn(s) + 4OH –1.285
Zn(NH3)42+ + 2e ⇌ Zn(s) + 4NH3 –1.04
Zn(CN)42− + 2e ⇌ Zn(s) + 4CN –1.34