Answer:
The sizes of the ions of Na and K as compared to the sizes
of\[M{{g}^{2+}}\] and \[C{{a}^{2+}}\] ions are larger. Thus, the lattice energies
of hydroxides and carbonates of sodium and potassium are much lower than those
of the hydroxides and carbonates of magnesium and calcium. Therefore, the
hydroxides and carbonates of Na and K are easily soluble in water than
corresponding compounds of Mg and Ca.
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