CsI is much less soluble in water than CsF and LiF is much

CsI is much less soluble in water than CsF , and LiF is much less soluble than LiI. Why?

Solution

Solubility of an ionic compound in water depends on the extent of dissossiation of ions. CsF is more ionic than CsI due to greater electronegativity of F.The more ionic a compound, the more is the extent of dissossiation of ions, so CsF is more soluble in water than CsI