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What is the order of ionic mobility in molten state for grp 1

What is the order of ionic mobility in molten state for grp 1
 

Grade:12th pass

1 Answers

Arun
25750 Points
4 years ago

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+ ionis 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.

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