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When ions dissolve in water, water molecules form intermolecular forces that release energy. The more water molecules, the more intermolecular forces formed, the more energy released when ions dissolve in water. How does the periodic trend of cation radius for the alkali chloride solids compare to the number of water molecules that can form attractions to an alkali cation?
Ionic Solid
Class AvgDH
Sign -/0/+
Lattice Energy (kJ/mol)
Cation Radius (pm)
LiCl
+
853
60
NaCl
0
787
95
KCl
-
715
133
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