If dissolution of a solid releases heat, what trend may its solubility show on increasing temperature?
Answer and explanation
Correct answer: It may decrease
When dissolution is exothermic, heat is released as the solute enters the solution. Increasing temperature can therefore favour the reverse direction and reduce the equilibrium solubility. The word may is important because the precise behaviour depends on the solute-solvent system and other thermodynamic effects. Heating does not automatically make every solid more soluble or make its solubility infinite.
Frequently asked questions
What is the correct answer to this question?
It may decrease
Why is this the correct answer?
When dissolution is exothermic, heat is released as the solute enters the solution. Increasing temperature can therefore favour the reverse direction and reduce the equilibrium solubility. The word may is important because the precise behaviour depends on the solute-solvent system and other thermodynamic effects. Heating does not automatically make every solid more soluble or make its solubility infinite.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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