Concept:Dissolution that gives out heat is an exothermic process, so temperature changes affect it according to Le Chatelier’s principle.
Explanation:The equilibrium can be written as
solute+solvent⇌solution+heat where heat is a product.
Increasing the temperature adds extra heat to the system.
The system opposes this change by shifting the equilibrium to the left.
This means the undissolved solid is favoured, so less solute dissolves.
Therefore, the solubility decreases when temperature increases.
On the other hand, lowering the temperature removes heat, shifting the equilibrium to the right and increasing solubility.
Thus, for solids that dissolve exothermically, solubility is inversely related to temperature.
Answer:B. decrease with an increase in temperature.