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Why are lithium salts commonly hydrated ...

Why are lithium salts commonly hydrated and those of the other alkali ions usually anhydrous?

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Because of high charge density among alkali metals, `Li^(o+)` can polarise water molecules more easily than the other alkali metal ions and hence get attached to lithium salts as water of crystallisation. For example, lithium chloride crystallises as `LiCl.2H_(2)O`.
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