Application of Electrochemical Series

1. The metal which has low standard reduction potential is more electropositive.

(i) S.R.P. ≤ -2.0 volt  strongly electropositive (I A group, II A group).
(ii) S.R.P. lie in between 0 to -2.0 V moderately electropositive (Al, Zn, Fe, Ni, Co etc).
(iii) S.R.P. > 0  weakly electropositive (Cu, Hg, Ag etc).

2. The metals which have low S.R.P. value are highly reactive.

(i) Alkali metal and alkaline earth metal have low S.R.P. value, so they are highly reactive and evolve H₂ from cold water.
(ii) Moderately electropositive metal are less reactive and evolve H₂ from steam.
(iii) Weakly electropositive metal are not able to evolve H₂ from water.

3. The metal which has low S.R.P. value can replace other metal from its salt.

4. Metals which have low S.R.P. value are strong reducing agents.

5. Non-metals which have higher S.R.P. value and are strong oxidising agents.

6. Metals which have low S.R.P. value, their oxides are thermally stable. Metal which have high S.R.P. value, their oxides are thermally unstable.

7. Cation having higher S.R.P. value will discharge first at cathode and anion having low S.R.P. value discharge first at anode.

(i) K⁺ < Ca⁺² < Na⁺ < Mg⁺² < Al⁺³ < Zn⁺² < Fe⁺² < H⁺ < Cu⁺² < Ag⁺ < Au⁺³
(Order of discharging at cathode)
(i) SO₄^-2 OH^- < Cl^- < Br^- < l^-
(Order of discharging at anode)

8. Metals which have low S.R.P. value have greater rate of corrosion.