Electromotive series

Half-reaction

Oxidant Reductant Eo(V)
Sr+ + e- Sr -4.10
Ca+ +e- Ca -3.8
Pr3+ +e- Pr2+ -3.1
3N2(g)+2H++ 2e- 2HN3(aq) -3.09
Li++ e- Li(s) -3.0401
N2(g)+ 4 H2O + 2e- 2NH2OH(aq) + 2 OH- -3.04
Cs++ e- Cs(s) -3.026
Ca(OH)2 + 2e- Ca + 2OH- -3.02
Er3++ e- Er2+ -3.0
Ba(OH)2 + 2e- Ba + 2OH- -2.99
Rb++ e- Rb(s) -2.98
K++ e- K(s) -2.931
Ba2++ 2e- Ba(s) -2.912
La(OH)3(s) + 3e- La(s) + 3OH- -2.90
Fr++ e- Fr -2.9
Sr2++ 2e- Sr(s) -2.899
Sr(OH)2 + 2e- Sr + 2OH- -2.88
Ca2++ 2e- Ca(s) -2.868
Eu2++ 2e- Eu(s) -2.812
Ho3++ e- Ho2+ -2.8
Bk3++ e- Bk2+ -2.8
Ra2++ 2e- Ra(s) -2.8
Yb2++ 2e- Yb -2.76
Na++ e- Na(s) -2.71
Mg++ e- Mg -2.70
Nd3++ e- Nd2+ -2.7
Mg(OH)2 + 2e- Mg + 2OH- -2.690
Sm2++ 2e- Sm -2.68
Be2O32-+ 3H2O + 4e- 2Be + 6OH- -2.63
Pm3++ e- Pm2+ -2.6
Dy3++ e- Dy2+ -2.6
No2++ 2e- No -2.50
HfO(OH)2 + H2O + 4e- Hf + 4OH- -2.50
Th(OH)4 + 4e- Th + 4OH- -2.48
Md2++ 2e- Md -2.40
Tm2++ 2e- Tm -2.4
La3++ 3e- La(s) -2.379
Y3++ 3e- Y(s) -2.372
Mg2++ 2e- Mg(s) -2.372
ZrO(OH)2(s) + H2O + 4e- Zr(s) + 4OH- -2.36
Pr3++ 3e- Pr -2.353
Ce3++ 3e- Ce -2.336
Er3++ 3e- Er -2.331
Ho3++ 3e- Ho -2.33
H2AlO3- + H2O + 3e- Al + 4OH- -2.33
Nd3++ 3e- Nd -2.323
Tm3++ 3e- Tm -2.319
Al(OH)3(s) + 3e- Al(s) + 3OH- -2.31
Sm3++ 3e- Sm -2.304