Which of the following best helps to explain why the value of ΔH° for the dissolving of CaF2 in water is positive? | Thermodynamics

Question

Which of the following best helps to explain why the value of ΔH° for the dissolving of CaF₂ in water is positive?

CaF₂(s) is insoluble in water.

CaF₂(s) dissolves in water to form CaF₂(aq) particles.

Ca²⁺ ions have very strong ion-ion interactions with F− ions in the crystal lattice.

✓ Correct

Ca²⁺ ions have very strong ion-dipole interactions with water molecules in the solution.

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