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Under which condition can precipitation be avoided?

Answer and explanation

Correct answer: Keep ionic product less than solubility product

For a salt, precipitation is thermodynamically favoured when the current ionic product Q exceeds Ksp. Keeping Q below Ksp keeps the solution unsaturated, so the ions can remain dissolved without forming that solid phase. At Q equal to Ksp the solution is just saturated; raising Q above this value promotes precipitation. The remaining options either promote separation or are chemically meaningless.

Related tags

EquilibriumPrecipitationKspSolubility Product And Common Ion EffectChemistryClass 11 Mcq

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