solubility product constant [´säl·yǝ`bil·ǝd·ē ¦präd·ǝkt ´kän·stǝnt] PHYSICAL CHEMISTRY A type of simplified equilibrium constant, Ksp, defined for and useful for equilibria between solids and their respective ions in solution; for example, the equilibrium where [Ag+] and [Cl-] are molar concentrations of silver ions and chloride ions. |