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Standard Reduction Potentials

Half-reactions Eθ (V)
Li+(aq) + e ⇌ Li(s) −3,05
K+(aq) + e ⇌ K(s) −2,93
Cs+(aq) + e ⇌ Cs(s) −2,92
Ba2+(aq) + 2e ⇌ Ba(s) −2,90
Sr2+(aq) + 2e ⇌ Sr(s) −2,89
Ca2+(aq) + 2e ⇌ Ca(s) −2,87
Na+(aq) + e ⇌ Na(s) −2,71
Mg2+(aq) + 2e ⇌ Mg(s) −2,36
Al3+(aq) + 3e ⇌ Al(s) −1,66
Mn2+(aq) + 2e ⇌ Mn(s) −1,18
Cr2+(aq) + 2e ⇌ Cr(s) −0,91
2H2O(l) + 2e ⇌ H2(g) + 2OH(aq) −0,83
Zn2+(aq) + 2e ⇌ Zn(s) −0,76
Cr3+(aq) + 3e ⇌ Cr(s) −0,74
Fe2+(aq) + 2e ⇌ Fe(s) −0,44
Cr3+(aq) + e ⇌ Cr2+(aq) −0,41
Cd2+(aq) + 2e ⇌ Cd(s) −0,40
Co2+(aq) + 2e ⇌ Co(s) −0,28
Ni2+(aq) + 2e ⇌ Ni(s) −0,27
Sn2+(aq) + 2e ⇌ Sn(s) −0,14
Pb2+(aq) + 2e ⇌ Pb(s) −0,13
Fe3+(aq) + 3e ⇌ Fe(s) −0,06
2H+(aq) + 2e ⇌ H2(g) 0,00
S(s) + 2H+(aq) + 2e ⇌ H2S(g) +0,14
Sn4+(aq) + 2e ⇌ Sn2+(aq) +0,15
Cu2+(aq) + e ⇌ Cu+(aq) +0,16
SO42−(aq) + 4H+(aq) + 2e ⇌ SO2(g) + 2H2O(l) +0,17
Cu2+(aq) + 2e ⇌ Cu(s) +0,34
2H2O(l) + O2(g) + 4e ⇌ 4OH(aq) +0,40
SO2(g) + 4H+ + 4e ⇌ S(s) + 2H2O(l) +0,45
Cu+(aq) + e ⇌ Cu(s) +0,52
I2(s) + 2e ⇌ 2I(aq) +0,54
O2(g) + 2H+(aq) + 2e ⇌ H2O2(aq) +0,68
Fe3+(aq) + e ⇌ Fe2+(aq) +0,77
NO3(aq) + 2H+(aq) + e ⇌ NO2(g) + H2O(l) +0,80
Ag+(aq) + e ⇌ Ag(s) +0,80
Hg2+(aq) + 2e ⇌ Hg(l) +0,85
NO3(aq) + 4H+(aq) + 3e ⇌ NO(g) + 2H2O(l) +0,96
Br2(l) + 2e ⇌ 2Br(aq) +1,07
Pt2+(aq) + 2e ⇌ Pt(s) +1,20
MnO2(aq) + 4H+(aq) + 2e ⇌ Mn2+(aq) + 2H2O(l) +1,23
O2(g) + 4H+(aq) + 4e ⇌ 2H2O(l) +1,23
Cr2O72−(aq) + 14H+(aq) + 6e ⇌ 2Cr3+(aq) + 7H2O(l) +1,33
Cl2(g) + 2e ⇌ 2Cl(aq) +1,36
MnO4(aq) + 8H+(aq) + 5e ⇌ Mn2+(aq) + 4H2O(l) +1,51
Au3+(aq) + 3e- ⇌ Au(s) +1,52
H2O2(aq) + 2H+(aq) + 2e ⇌ 2H2O(l) +1,77
Co3+(aq) + e ⇌ Co2+(aq) +1,81
F2(g) + 2e ⇌ 2F(aq) +2,87