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Why does solubility of PbI2 decrease if it is dissolved in a solution with Iodine ions already present?

April 26, 2017Chemistry Dissolved Iodine ions Mathematics solubility solution

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Why does solubility of PbI2 decrease if it is dissolved in a solution with Iodine ions already present?

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If iodine ions are already present in the solution, the equilibrium is shifted towards the reactants and away from the products. You could think of it like PbI2 being discouraged to dissolve is the solution because it has to maintain an equilibrium.