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Arrange LiCl, NaCl and KCl in the correct order of their equivalent (molar) conductance at infinite dilution.

1. LiCl > NaCl > KCl
2. KCl > NaCl > LiCl
3. NaCl > KCl > LiCl
4. LiCl > KCl > NaCl

Correct answer: KCl > NaCl > LiCl

Solution

At infinite dilution the chloride contribution is the same for all three. The difference lies in cation mobility. Although Li+ has the smallest crystal radius, it has the largest hydrated radius (most heavily hydrated), so it moves slowest. K+ is least hydrated and moves fastest. Hence conductance order is KCl > NaCl > LiCl.

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