Explain the trend in group II hydroxides

Solubility of group 2 metal hydroxides

The solubility of group 2A hydroxides increases down the group from Be(OH)₂ to Ba(OH)₂ due to

• an increase in ionic character of the hydroxides and
• the decrease in lattice energy as the sizes of the cations increase. Down the group, both hydration and lattice energies decrease; but the lattice energy decreases more rapidly than the hydration energies leading to the increase in the solubility of the hydroxides down the group.

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