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E^(0)" for " M^(2+)(aq) + e to M(s) (whe...

`E^(0)" for " M^(2+)(aq) + e to M(s)` (where, M = Ca, Sr or Ba) is nearly constant. Comment.

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Value of standard electrode potential `(E^0)` of any `M^(2+)//M` electrode depends upon three factors-1. enthalpy of vaporisaiton, 2. nisation enthalpy and 3. enthalpy of hydration. Since the combined effect of these factors is approximately same for Ca, Sr and Ba, their standard electrode potential `(E^0)` values are nearly constant.
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