Final answer:
Statement D is true: the higher the Ksp, the more soluble the compound is. Ksp is a measure of solubility in terms of ion concentration, and a higher value indicates greater solubility.
Step-by-step explanation:
The correct statement about the solubility product constant, Ksp, is D. The higher the Ksp, the more soluble the compound is. The Ksp is a measure of the solubility of a compound in terms of the molar concentrations of its component ions in solution. A higher Ksp indicates that more solid can dissolve before reaching equilibrium, which means the compound has a greater solubility. Conversely, a low Ksp value implies that the compound is less soluble, and fewer ions will be present in solution. Solubility can also be influenced by the presence of common ions, following Le Chatelier's principle, which may reduce the solubility of a sparingly soluble salt by shifting the equilibrium.