Comment on each of the following observations:
for M²⁺ (aq) + 2e^– → M(s) (where M = Ca, Sr or Ba) is nearly constant.

Question

Comment on each of the following observations: for M 2+ (aq) + 2e – → M(s) (where M = Ca, Sr or Ba) is nearly constant.

Philoid · Accepted Answer

E^° of any M²⁺/ M electrode depends upon the following three factors:

⇒ Enthalpy of vaporization

⇒ Ionization enthalpy

⇒ Enthalpy of hydration

Since, the combining effect of three factors is approximately the same for Ca, Sr ad Ba, therefore, their electrode potentials are nearly constant.

Comment on each of the following observations: for M2+ (aq) + 2e– → M(s) (where M = Ca, Sr or Ba) is nearly constant.