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Why are lithium salts commonly hydrated ...

Why are lithium salts commonly hydrated while those of other alkali metal ions ar usually anhydrous?

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In the lithium salts, the lithium ion `(Li^(+))` due to very small size gests readily hydrated on coming in contact with moisture (or water). Therefore, lithium salts are commonly hydrated. But the other alkali metal ions are comparatively big in size. They hav therefore, lesser tendency to get hydrated. These salts are usually anhydrous.
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