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(D) The solubility of ionic compounds in water is determined by the balance between lattice enthalpy and hydration enthalpy. For a compound to be solu

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Their high lattice enthalpy

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(D) The solubility of ionic compounds in water is determined by the balance between lattice enthalpy and hydration enthalpy. For a compound to be soluble,the hydration enthalpy must be greater than the lattice enthalpy. Alkaline earth metals have smaller ionic radii and higher charges compared to alkali metals,which results in significantly higher lattice enthalpies for their compounds. Although their hydration enthalpies are also higher,the increase in lattice enthalpy is more dominant,making the overall dissolution process less favorable compared to alkali metal compounds.

Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal compounds due to

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