Question

At a given temperature, which of the following statements is correct regarding the solubility of a solid in a liquid?

• A. It always increases with increase in temperature.
• B. It always decreases with increase in temperature.
• C. It may increase or decrease depending on the enthalpy change.
• D. It does not depend on temperature.

Hint:

Always check the sign of enthalpy change to predict the effect of temperature on solubility.

Answer 1

The Correct Option is C

The solubility of a solid in a liquid is influenced by the enthalpy change of the dissolution process. If the process is endothermic (absorbs heat), solubility increases with temperature. If the process is exothermic (releases heat), solubility decreases with temperature. Hence, there is no general rule, and it depends on the nature of the solute and solvent interaction.