Standard Reduction Potentials (25oC)
Half-Cell Reactions  Eo
F2(g) +  2e-1 ---------> 2F-1(aq) +2.87
O3(g) + 2H+1(aq) + 2e-1 ---------> O2(g) + H2O(l) +2.08
S2O82-(aq) + 2e-1 ---------> 2 SO42-(aq) +2.05 
Co3+(aq) + e-1 --------->  Co2+(aq) +1.82
H2O2(aq) + 2 H+1(aq) + 2e-1 ---------> 2 H2O(l) +1.77
MnO4-1(aq) +  4 H+1(aq) + 3e-1 ---------> MnO2(s) + 2 H2O(l) +1.695
PbO2(s) + SO42-(aq) + 4 H+1(aq) + 2e-1 ---------> PbSO4(s) + 2 H2O(l) +1.69
2 HOCl(aq) + 2 H+1(aq) + 2e-1 ---------> Cl2(g) + 2 H2O(l) +1.63
Mn3+(aq) + e-1 ---------> Mn2+(aq) +1.51
MnO4-1(aq) +  8 H+1(aq) + 5e-1 ---------> Mn2+(aq) + 4 H2O(l) +1.49
PbO2(s) + 4 H+1(aq) + 2e-1 ---------> Pb2+(aq) + 2 H2O(l) +1.46
BrO3-1(aq) + 6 H+1(aq) + 6e-1 ---------> Br-1(aq) + 3 H2O(l) +1.44
Au3+(aq) + 3e-1 ---------> Au(s) +1.42
Cl2(g) + 2e-1 ---------> 2 Cl-1(aq) +1.36
Cr2O72-(aq) + 14 H+1(aq) + 6e-1 ---------> 2 Cr3+(aq) + 7 H2O(l) +1.33
O3(g) + H2O(l)  + 2e-1 ---------> O2(g) + 2 OH-1(aq) +1.24
MnO2(s) + 4 H+1(aq) + 2e-1 ---------> Mn2+(aq) + 2 H2O(l) +1.23
O2(g) +  4 H+1(aq) + 4e-1 ---------> 2 H2O(l) +1.23
Pt2+(aq) + 2e-1 ---------> Pt(s) +1.20
Br2(aq) + 2e-1 ---------> 2 Br-1(aq) +1.07
NO3-1(aq) + 4 H+1(aq) + 3e-1 ---------> NO(g) + 2 H2O(l) +0.96
NO3-1(aq) + 3 H+1(aq) + 2e-1 ---------> HNO2(g) + H2O(l) +0.94
2 Hg2+(aq) + 2e-1 ---------> Hg22+(aq) +0.91
HO2-1(aq) + H2O(l) + 2e-1 ---------> 3 OH-1(aq) +0.87
2 NO3-1(aq) + 4 H+1(aq) + 2e-1 ---------> 2 NO2(g) + 2H2O(l) +0.80
Ag+1(aq) + e-1 ---------> Ag(s) +0.80
Fe3+(aq) + e-1 ---------> Fe2+ (aq) +0.77
O2(g) + 2H+1(aq) + 2e-1 ---------> H2O2(aq) +0.69
I2(s) + 2e-1 ---------> 2 I-1(aq) +0.54
NiO2(s) + 2 H2O(l) + 2e-1   ---------> Ni(OH)2 + 2 OH-1(aq) +0.49
SO2(aq) + 4 H+1(aq) + 4e-1 ---------> S(s) + 2 H2O(l) +0.45
O2(g) + 2 H2O(l) + 4e-1 ---------> 4 OH-1(aq) +0.401
Cu2+(aq) + 2e-1 ---------> Cu(s) +0.34
Hg2Cl2(s) + 2e-1 ---------> 2 Hg(l) + 2 Cl-1(aq) +0.27
PbO2(s) + H2O(l) + 2e-1 ---------> PbO(s) + 2 OH-1(aq)  +0.25
AgCl(s) + e-1 ---------> Ag(s) + Cl-1(aq) +0.2223
SO42-(aq) + 4H+1(aq) + 2e-1 ---------> H2SO3(aq) + H2O(l) +0.172
S4O62-(aq) + 2e-1 ---------> 2 S2O32-(aq) +0.169
Cu2+(aq) + e-1 ---------> Cu+1(aq) +0.16
Sn4+(aq) + 2e-1 ---------> Sn2+(aq) +0.15
S(s) + 2H+1(aq) + 2e-1 ---------> H2S(g) +0.14
AgBr(s) + e-1 ---------> Ag(s) + Br-1(aq) +0.07
2 H+1(aq) + 2e-1 ---------> H2(g)    0.00
Pb2+(aq) + 2e-1 ---------> Pb(s) -0.13
Sn2+(aq) + 2e-1 ---------> Sn(s) -0.14
AgI(s) + e-1 ---------> Ag(s) + I-1(aq) -0.15
Ni2+(aq) + 2e-1 ---------> Ni(s) -0.25
Co2+(aq) +2e-1 ---------> Co(s) -0.28
In3+(aq) + 3e-1 ---------> In(s) -0.34
Tl+1(aq) + e-1 ---------> Tl(s) -0.34
PbSO4(s) + 2e-1 ---------> Pb(s) + SO42-(aq) -0.36
Cd2+(aq) + 2e-1 ---------> Cd(s) -0.40
Fe2+(aq) + 2e-1 ---------> Fe(s) -0.44
Ga3+(aq) + 3e-1 ---------> Ga(s) -0.56
PbO(s) + H2O(l) + 2e-1 ---------> Pb(s) + 2 OH-1(aq) -0.58
Cr3-(aq) + 3e-1 ---------> Cr(s) -0.74
Zn2+(aq) + 2e-1 ---------> Zn(s) -0.76
Cd(OH)2(s) + 2e-1 ---------> Cd(s) + 2 OH-1(aq) -0.81
2 H2O(l) + 2e-1 ---------> H2(g) + 2 OH-1(aq) -0.83
Fe(OH)2(s) + 2e-1 ---------> Fe(s) + 2 OH-1(aq) -0.88
Cr2+(aq) + 2e-1 ---------> Cr(s) -0.91
N2(g) + 4 H2O(l) + 4e-1 ---------> N2O4(aq) +4 OH-1(aq) -1.16
V2+(aq) + 2e-1 ---------> V(s) -1.18
ZnO2-1(aq) + 2 H2O(l) + 2e-1 ---------> Zn(s) + 4OH-1(aq) -1.216
Ti2+(aq) + 2e-1 ---------> Ti(s) -1.63
Al3+(aq) + 3e-1 ---------> Al(s) -1.66
U3+(aq) + 3e-1 ---------> U(s) -1.79
Sc3+(aq) + 3e-1 ---------> Sc(s) -2.02
La3+(aq) + 3e-1 ---------> La(s) -2.36
Y3+(aq) + 3e-1 ---------> Y(s) -2.37
Mg2+(aq) + 2e-1 ---------> Mg(s) -2.37
Na+1(aq) + e-1 ---------> Na(s) -2.71
Ca2+(aq) + 2e-1 ---------> Ca(s) -2.76
Sr2+(aq) + 2e-1 ---------> Sr(s) -2.89
Ba2+(aq) + 2e-1 ---------> Ba(s) -2.90
Cs+1(aq) +e-1 ---------> Cs(s) -2.92
K+1(aq) + e-1 ---------> K(s) -2.92
Rb+1(aq) + e-1 ---------> Rb(s) -2.93
Li+1(aq) + e-1 ---------> Li(s) -3.05