Based only on the relative lattice energies of the compounds below, which one would be expected to have the lowest solubility in water?
A)NaBr
B)CaS
C)NaOH
D)KI
E)CsCl

Question

Quizplus · Accepted Answer

Compounds with higher lattice energies tend to be less soluble in water because a lot of energy is needed to break the strong ionic bonds between the ions in the lattice. CaS has a higher lattice energy compared to the other options because calcium and sulfur have stronger ionic bonds than the other pairs of elements in the other options, so CaS is expected to have the lowest solubility in water.

Based Only on the Relative Lattice Energies of the Compounds