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A capital K with sp as a subscript.
Also known as: Ksp, Solubility product, Solubility constant
Ksp is the equilibrium constant for a sparingly soluble salt dissolving, and the solid does not appear in the expression — pure solids have unit activity. That omission is why adding more solid to a saturated solution changes nothing.
Denotes the equilibrium constant for the dissolution of a sparingly soluble ionic solid into its ions.
Contexts: Laboratory
Omits the solid from the expression, because a pure solid has unit activity — which is why adding more undissolved solid does not shift the equilibrium.
Contexts: Laboratory
Predicts the common-ion effect directly: adding one of the ions from another source suppresses dissolution.
Contexts: Laboratory
A capital letter K with the two small lowercase letters s and p set below and to the right.