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 enthalpy change of dissolution governs a solid's solubility in a liquid. Endothermic dissolution (heat absorption) leads to increased solubility with rising temperature. Exothermic dissolution (heat release) results in decreased solubility as temperature increases. Consequently, a universal rule is absent, with solubility contingent on solute-solvent interaction characteristics.