According to general thermodynamic principles, the solubility of an exothermic dissolution process s — Chemical Equilibrium Chemistry Question
Question
According to general thermodynamic principles, the solubility of an exothermic dissolution process should decrease with an increase in temperature. Which of the following solid substances is a notable exception to this rule, where its solubility increases with temperature despite the dissolution being an exothermic process?
Answer: B
💡 Solution & Explanation
The dissolution of $NaOH$ in water is highly exothermic ($\Delta H < 0$). However, experimentally, its solubility increases with an increase in temperature, which is a standard exception often tested in equilibrium phase shifts.
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