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Question

Explain Solvation enthalpy of ionic compounds and give the difference between solubility and solvation enthalpy?

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Solution

The enthalpy change of solution is the enthalpy change when 1 mole of an ionic substance dissolves in water to give a solution of infinite dilution.

Enthalpies of solution may be either positive or negative - in other words, some ionic substances dissolved endothermically (for example, NaCl); others dissolve exothermically (for example NaOH).

Solvation describes the interaction of solventwith dissolved molecules. Ionized and uncharged molecules, interact strongly with solvent, and the strength and nature of this interaction influences many properties of the solute, including solubility, reactivity, and color, as well as influencing the properties of the solvent such as the viscosity and density.In the process of solvation, ions are surrounded by a concentric shell of solvent. Solvation is the process of reorganizing solvent and solute molecules into solvation complexes. Solvation involves bond formation, hydrogen bonding, and van der Waals forces. Solvation of a solute by water is called hydration.

The energy of solvation is the amount of energy associated with dissolving a solute in a solvent. If it is a positive number, the dissolving process is endothermic; if it is negative, it's exothermic.


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