arrange in increasing solubility in water : Mg(OH)2 , Sr(OH)2, Ba(OH)2, Ca(OH)2
Solubility of metallic hydroxides increases down the group in the alkaline earth metal. So the increasing order is
Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2.
Higher the hydration energy compared to lattice energy, higher will be the solubility
Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2.
Higher the hydration energy compared to lattice energy, higher will be the solubility