An ionic compound has and .

CHEMISTRY · Multi-part · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

An ionic compound has ΔHdiss∘=−12 kJ mol−1\Delta H^{\circ}_{\text{diss}} = -12\,\text{kJ mol}^{-1} and ΔSdiss∘=−55 J mol−1 K−1\Delta S^{\circ}_{\text{diss}} = -55\,\text{J mol}^{-1}\,\text{K}^{-1}. (a) Calculate ΔGdiss∘\Delta G^{\circ}_{\text{diss}} at 298 K298\,\text{K}. (b) Determine the temperature (in ∘C^{\circ}\text{C}) at which the dissolution just becomes spontaneous. (c) If a saturated solution at 25∘C25^{\circ}\text{C} is cooled to 0∘C0^{\circ}\text{C}, predict qualitatively whether the solubility will increase, decrease, or remain unchanged, and justify your answer.

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