Concept:Precipitation is the physical manifestation of a solution pushing excess dissolved ions out of the liquid phase to restore equilibrium.
Formula:$$ \text{Ionic Product } (Q_{sp}) > K_{sp} $$
Solution:- \( K_{sp} \) defines the absolute maximum limit of ions a solution can stably hold at equilibrium.
- If the product of the ionic concentrations in the solution exceeds this limit (\( Q_{sp} > K_{sp} \)), the solution is unstable (supersaturated).
- The excess ions will clump together and form a solid precipitate until the concentration drops back to the \( K_{sp} \) limit.
Why other options are incorrect:Less than \( K_{sp} \) means more can dissolve. Equal to \( K_{sp} \) means it is perfectly saturated and stable without precipitation.
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