Why would you expect or predict sodium fluoride to have the lowest solubility in water compared to the other sodium halide salts?
A)Fluoride has the largest (most negative) enthalpy of hydration of all the halide ions.
B)Fluoride has the smallest (least negative) enthalpy of hydration of all the halide ions.
C)Sodium fluoride has the largest (most negative) lattice energy of all the sodium halides.
D)Sodium fluoride has the smallest molar mass of all the sodium halides.
E)Fluoride is the most basic of all the halide ions and forms HF in aqueous solution.

Question

Quizplus · Accepted Answer

The solubility of an ionic compound is affected by both the enthalpy of hydration (the energy released when ions combine with water molecules) and the lattice energy (the energy required to break apart the crystal lattice of the compound). In general, the higher the lattice energy, the lower the solubility. Among the sodium halide salts, sodium fluoride has the highest lattice energy due to the small size of the fluoride ion, which allows for more efficient packing in the crystal lattice. Therefore, we would expect it to have the lowest solubility in water compared to the other sodium halides.

Why Would You Expect or Predict Sodium Fluoride to Have