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Hydration of alkali metal ions
Concepts tested here
- Hydrated ionic size
All Questions
2012 AIPMT-PRE 1 question
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The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin follows the order:The smaller the bare ion, the more it is hydrated: hydrated size is $Li^+ > Na^+ > K^+ > Rb^+$.
The greater the size of the hydrated ion, the greater its surface area and its ease of adsorption (as given in the source solution).
So the ease of adsorption is $Rb^+ < K^+ < Na^+ < Li^+$.