Question

What happens to the solubility in an exothermic process in regard to temperature?

Answer 1

Increasing the temperature results in a stress on the products side from the additional heat. Le Châtelier's principle predicts that the system shifts toward the reactant side in order to alleviate this stress. By shifting towards the reactant's side, less of the solid is dissociated when equilibrium is again established, resulting in decreased solubility. Thus in an exothermic process, solubility decreases with increase in temperature.

E.g. Solubility of CaO decreases with increase in temperature.