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Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone ?

Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone ?

Grade:12

1 Answers

Gaurav
askIITians Faculty 164 Points
9 years ago
This is mainly because of the greater ionic character of LiF as compared to LiCI. The solubility of a compound in water depends on the balance between lattice energy and hydration energy. Since fluoride ion is much smaller in size than chloride ion, the lattice energy of LiF is greater than that of LiCI. Also, there is not much difference between the hydration energies of fluoride ion and chloride ion. Thus, the net energy change during the dissolution of LiCI in water is more exothermic than that during the dissolution of LiF in water. Hence, low lattice energy and greater covalent character are the factors making LiCI soluble not only in water, but also in acetone.

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