Final answer:
After precipitation is complete, the concentration of each ion remaining in solution depends on the solubility product and the concentrations of other salts that contain the same ions. The ion forming the least soluble compound will precipitate first, with the other ions subsequently precipitating as their compound's solubilities are reached.
Step-by-step explanation:
After precipitation is complete, the concentration of each ion remaining in solution depends on the solubility product and the concentrations of other salts that contain the same ions. The solubility product expression tells us that the equilibrium concentrations of the cation and the anion are inversely related. Consequently, the solubility of an ionic compound depends on the concentrations of other salts that contain the same ions. In solutions with equal concentrations of target ions, the ion forming the least soluble compound will precipitate first, with the other ions subsequently precipitating as their compound's solubilities are reached.