Question

Dissolution of a solid X in water is exothermic. How does its solubility change with temperature.?

Answer 1

1. The process of dissolving a substance in a given solvent is called dissolution.
2. Solubility is a chemical property referring to a given substance ability to dissolve in a solvent.
3. A chemical reaction in which heat energy released is called exothermic reaction.
4. Rate of dissolution of most of solids increases with the increase in temperature.
5. For an exothermic reaction, the value of K decreases with increase in temperature.
6. By increasing the temperature, heat is added to the product side, which drive the equilibrium towards the reactant side.
7. Since, it is an exothermic reaction, at higher temperature, the solubility of X decreases.
8. Therefore, with the increases in temperature, the solubility of X decreases in the case of an exothermic reaction.