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

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The atomic size of sodium and potassium is larger than that of magnesium and calcium. So, the lattice energy of carbonates and oxides formed by sodium and potassium are less than that of calcium and magnesium. Therefore, the carbonates and oxides of Na and K are readily dissolved in water, and Mg and Ca are sparingly soluble in water. 

 

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