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Answer -
LiFis insoluble in water. On the contrary, LiCl is soluble not only in water, butalso in acetone. This is mainly because of the greater ionic character of LiFas compared to LiCl. The solubility of a compound in water depends on thebalance between lattice energy and hydration energy. Since fluoride ion is muchsmaller in size than chloride ion, the lattice energy of LiF is greater thanthat of LiCl. Also, there is not much difference between the hydration energiesof fluoride ion and chloride ion. Thus, the net energy change during thedissolution of LiCl in water is more exothermic than that during thedissolution of LiF in water. Hence, low lattice energy and greater covalentcharacter are the factors making LiCl soluble not only in water, but also in acetone.