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Correct order of ionic mobility of alkaline earth metals

Correct order of ionic mobility of alkaline earth metals

Grade:12th pass

1 Answers

Arun
25750 Points
6 years ago
Dear student
 

First of all mobility is observed in any solution, so i am concedering Aqueous solution of alkaline metals.

The alkali metal ion exist as hydrated ions

M+(H2O) -

in the aqueous solution. The degree of hydration, decreases with ionic size as we go down the group. Hence Li+ ion is mostly hydrated e.g. [Li(H2O) 6]. Since the mobility of ions is inversely proportional to the size of the their hydrated ions, hence the increasing order of ionic mobility is

Li+

Because as we come down the periodic table the size of hydrathed alkaline metal decreases.

 

Regards

Arun (askIITians forum expert)

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