Which of the following is the most favourable condition for the solubility of an ionic compound in water?
high lattice enthalpy and high hydration enthalpy of its ions
low lattice enthalpy and high hydration enthalpy of its ions
low lattice enthalpy and low hydration enthalpy of its ions
high lattice enthalpy and low hydration enthalpy of its ions
As we learnt,
The solubility or the heat of solution of an ionic compound is related to the lattice energy and the heat of hydration of the ions
The enthalpy of solution, enthalpy of hydration and the lattice energy can be related as
High negative values for is a favourable condition for the solubility of ionic compounds
Thus, for greater solubility, the lattice energy should be low and the hydration enthalpy shoud be high.
Thus, the correct answer is Option (2)
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