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Which of the alkali metal chloride (MCl) forms its dihydrate salt (MCl·2H2O) easily?

1. KCl
2. LiCl
3. CsCl
4. RbCl

Correct answer: LiCl

Solution

Lithium chloride (LiCl) forms its dihydrate salt (LiCl·2H2O) easily due to its high hydration enthalpy, which is a result of the small size and high charge density of the lithium ion.

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