Give reason for the low solubility of LiF & CsI in water.

Give reason for the low solubility of LiF & CsI in water. 
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Answer :

The low solubility of LiF in water is due to its high lattice enthalpy whereas the low solubility of CsI is due to smaller hydration enthalpy of its two ions. Other halides of lithium are soluble in ethanol, acetone and ethylacetate; LiCl is soluble in pyridine also. 
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