d) An ionic compound has a highly negative ΔHsoln in water. Would you expect it to be very soluble or nearly insoluble in water? Explain in terms of enthalpy and entropy changes
d) An ionic compound has a highly negative ΔHsoln in water. Would you expect it to be very soluble or nearly insoluble in water? Explain in terms of enthalpy and entropy changes.
The solubility of ionic compound in water when ΔHsoln is highly negative.
Hydration is a process where the solute molecule is surrounded by the water molecules.
Thus, the enthalpy changes for the solution is equal to the sum of the heat of hydration and heat of solute .
Thus, ∆H< 0, it indicates that the reaction is exothermic.
Therefore, the ionic compound is highly soluble when ∆H< 0 which increases the entropy of the solution.
Ionic solid(s)
When an ionic compound is completely soluble in water, the hydration shells are formed hence ions are separated from each other. Thus entropy increases.
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