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When an ionic compound dissolves in water, the process involves which of the following?

1. Evolution of heat
2. Weakening of attractive forces
3. Dissociation into ions
4. All of these

Correct answer: All of these

Solution

Dissolution of an ionic solid breaks the lattice (weakening attractive forces), separates the ions (dissociation), and is accompanied by enthalpy changes (commonly heat is evolved on hydration), so all the listed features occur.

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