Comment of the following observations : E^("ϴ") for M_((aq))^(2+) +2e^(-) to 2e^(-) to M_((s)) (where, M = Ca, Sr or Ba) is nearly constant.

Comment of the following observations : E^("ϴ") for M_((aq))^(2+) +2

1.	Comment of the following observations : E^("ϴ") for M_((aq))^(2+) +2e^(-) to 2e^(-) to M_((s)) (where, M = Ca, Sr or Ba) is nearly constant.
Answer» Solution : Electrode potential `(E^(0))`of any `M_(2)^(2+)//M` electrode depends upon three factors : (i) Ionization enthalpy (ii) Enthalpy of hydration, (iii) Enthalpy of VAPOURIZATION. The combined effect of these factors is approximately the same for CA, Sr, and Ba. Hence, their electrode potentials are nearly constant.