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Question
The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to ______.
Options
Ionic nature of lithium fluoride.
High lattice enthalpy.
High hydration enthalpy for lithium ion.
Low ionisation enthalpy of lithium atom.
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Solution
The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to high lattice enthalpy.
Explanation:
Due to small size of Li+ and F– ions, lattice enthalpy is much higher than hydration enthalpy and hence LiF is least soluble among alkali metal fluorides.
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