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Why does the solubility of alkaline eart...

 Why does the solubility of alkaline earth metal hydroxides in water increase down the group?

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Among alkaline earth metal hydroxides , the anion , i.e., `OH^(-)` ion is common , therefore , the lattice enthalpy depends upon the size of the cation . Since the lattice enthalpy decreases much more rapidly than the hydration enthalpy with increasing ionic size , the solubility of the metal hydroxides increases as we move down the group .
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