Step 1: Understand the relationship between ionic product and solubility product.
The ionic product is the product of the concentrations of ions in a solution.
The solubility product is the equilibrium constant for the dissolution of a salt in a solvent.
Step 2: Conditions for precipitation.
Precipitation occurs when the ionic product exceeds the solubility product, indicating that the solution is supersaturated and the excess ions will form a precipitate.