The Common Ion effect is very pronounced for insoluble salts.
Certain salts become more soluble as the pH of the solution drops. This is just an application of Le Chatelier’s Principle.
Just as for regular Equilibrium, where we defined the Reaction Quotient Q, we have the analogous Qsp.
Qsp can be calculated with concentrations at any time, then compared to Ksp to decide if a precipitate will form.
Solubility Equilibria, Part II
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