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Why dissolution of some solid compounds ...

Why dissolution of some solid compounds is exothermic while that of some others is endothermic?

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If solute - solvent interactions are stronger than solute- solute or solvent - solvent interactions, energy is released and the dissolution is exothermic. If solute- solvent interactions are weaker than solute-solute or solvent- solvent interaction, energy is absorbed and the dissolution is endothermic.
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