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Chemistry Reference Data
Standard Reduction Table

Standard Reduction Potentials at 25°C (298 K)

Half -reaction E° (V)
F2 +2 e - 2 F - 2.87
Ag2+ + e -  Ag+ 1.99
Co3+ + e - Co2+ 1.82
H2O2+ 2 H+ + 2 e - 2 H2O 1.78
PbO2 + 4 H+ + SO4 2- + 2 e - PbSO4 + 2 H2O 1.69
MnO4-1 + 4 H+ + 3 e - MnO2 + 2 H2O 1.68
Ce4+ e - Ce3+ 1.61
2 H+ + IO4 - +2 e - IO3 -+ 2 H2O 1.60
BrO3 - + 6 H+ + 5 e - ½ Br2 +3 H2O 1.52
MnO4 - + 8 H+ + 5 e - Mn2+ + 4 H2O 1.51
Au3+ + 3 e - Au 1.50
PbO2 + 4 H+ + 2 e - Pb2+ + 2 H2O 1.46
ClO4 -+8 H+ +8 e -   4 H2O +Cl - 1.39
Cl2 + 2 e -  2 Cl - 1.36
Cr2O72- + 14 H+ +6 e - 2 Cr3+ + 7 H2O 1.33
O2 + 4 H+ + 4 e - 2 H2O 1.23
MnO2 + 4 H+ + 2 e - Mn2+ + 2 H2O 1.23
IO3 -+ 6 H+ + 5 e - ½ I2 + 3 H2O 1.20
SeO42- + 4 H+ + 5 e - H2SeO3 +H2O 1.15
Br2 + 2 e - 2 Br - 1.06
ICl2 -+ e - ½ I2 + 2 Cl - 1.06
VO2+ +   2 H+  + e - VO2+ + H2O 1.00
AuCl4 - + 3 e - Au + 4 Cl - .99
NO3 - + 4 H+ + 3 e - NO + 2 H2O .96
ClO2 + e - ClO2 - .95
2 Hg2+  + 2 e - Hg22+ .91
HO2 -+ H2O +2 e - 3 OH - .88
AuCl4 - + 3 e - Au + 4 Cl - .86
Cu2+ + I - +e - CuI .86
Hg2+ + 2 e - Hg .85
½ O2(g)+ 2 H+(10-7M) + 2 e - H2O .82
Hg22++ 2 e - 2 Hg .80
Ag+ + e - Ag .80
Fe3+ + e - Fe2+ .77
O2 + 2 H+ + 2 e - H2O2 .68
MnO4 - + 2 H2O +3 e - 4 OH+ MnO2 .59
MnO4 - + e - MnO4 2- .56
H3AsO4+ 2 H+ + 2 e - H3AsO3+ H2O .56
I2 + 2 e - 2I - .54
I3 -+ 2 e - 2I - .536
Cu+ + e - Cu .52
O2 + 2 H2O + 4 e - 4 OH - .40
Ag(NH3) 3+1 + e - 2 NH3 +Ag .37
Cu2+ +2 e - Cu .34
Hg2Cl2 +  2 e - 2 Hg +2 Cl - .27
IO3 -+ 3 H2O+ 6 e - I -+ 6 OH - .26
AgCl + e - Ag + Cl - .22
SO42- + 4 H+ + 2 e - H2SO3 + H2O .20
Cu2+ + e - Cu+ .16
Sn4++2 e - Sn2+ .15
S +2 H+ 2 e - H2S .141
S4O62-+2 e - 2 S2O32- .08
AgBr + e - Ag + Br - .071
Ag(S2O3) 23- + e - Ag + 2 S2O32- .01
2 H+ 2 e - H2 .00
Fe 3+ + 3 e - Fe -.036
Hg2I2 +  2 e - 2 Hg + 2 I - -.04
HgI42- + 2 e - Hg + 4 I - -.04
Pb2+ + 2 e -  Pb -.13
Sn2+ + 2 e -  Sn -.14
AgI+ e -  Ag + I - -.15
Ni2+ + 2 e - Ni -.23
H3PO4 + 2 H+ + 2 e - H3PO4 + H2O -.27
PbCl2 + 2 e - Pb + 2 Cl - -.27
Co2++ 2 e - Co -.28
PbBr2 + 2 e - Pb + 2 Br - -.28
Ag(CN) 2 -+ 2 e - Ag +2 CN - -.31
Tl+ + e -Tl -.34
PbSO4 + 2 e - Pb + SO4 2- -.35
Hg(CN)42-  + 2 e - Hg +4 CN - -.37
PbI2 + 2 e - Pb +2 I - -.37
Cd2+ + 2 e - Cd -.40
Cr3+ + e - Cr2+ -.41
2H2O +2 e - H2(g) + 2 OH -(10-7M) -.41
PbSO4 + 2 e - Pb+ SO42- -.41
Fe2+ + 2 e - Fe -.44
Cd(NH3)42+ + 2 e - Cd + 4 NH3 -.60
SO42- + 4H2O +8e - 8OH -+ S2- -.68
Ag2S + 2 e - 2 Ag + S2- -.69
HgS + 2 e - S2- -.72
Cr3+ + 3 e - Cr -.73
Zn2+ +  2 e - Zn -.76
2 H2O + 2 e - H2 + 2 OH - -.83
Fe(OH)2 +2 e -Fe(s) +2 OH - -.88
SO42- + H2O +2 e - SO32- + 2 OH - -.93
PbS+2 e - Pb + S2- -.95
CNO - +H2O +2 e - CN - + 2 OH - -.97
Zn(NH3)42+ + 2 e - Zn + 4 NH3 -1.01
Mn2+ + 2 e - Mn -1.18
CdS + 2 e Cd + S2- -1.21
Zn(CN) 42- + 2 e - Zn + 4 CN-1 -1.26
ZnS + 2 e - Zn + S2- -1.44
A13+ + 3 e - Al -1.66
H2 +2 e - 2 H - -2.23
Mg2+ + 2 e - Mg -2.37
La 3+ + 3 e - La -2.37
Mg(OH)2 + 2 e - Mg + 2 OH - -2.69
Na+ + e - Na -2.71
Ca2+   + 2 e - Ca -2.87
Ba2+ + 2 e - Ba -2.90
K+ + e - K -2.92
Li+ + e - Li -3.05

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