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in S - block elements - alkali and alkaline earth metals by (57.6k points)

The hydroxides and carbonates of sodium and potassium are easily soluble while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain. 

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Alkaline earth metal cations possess high lattice energy due to their small size and higher charge. The hydration energy can not compensate for the energy required to break the lattice in these compounds.

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