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CBSE Class 11-science Answered

why is LiF almost insoluble in water whereas LiCl is soluble not only in water but in acetone also?
Asked by | 16 Mar, 2013, 10:21: PM
Expert Answer
This is mainly because of the greater ionic character of LiF as compared to LiCl. 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 LiCl. 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 LiCl 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 LiCl soluble not only in water, but also in acetone.
Answered by | 18 Mar, 2013, 05:38: AM
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