Why does the solubility of alkaline earth metal hydroxides in water increase down the group?
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The hydration enthalpy also decreases since the size of the cation increases. However, due to the square factor, the lattice enthalpy decreases faster than the hydration enthalpy. This is why the solubility of Group 2 hydroxides increases while progressing down the group
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Answer:
Among alkaline earth metal hydroxides, the anion being common, the cationic radius will influence the lattice enthalpy.Since lattice enthalpy decreases much more than the hydration enthalpy with increasing ionic size, the solubility increases down the group
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