Chemistry / Unit 10 Chem 1925 short lesson, about 20 seconds
Selective Precipitation
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The idea
Selective precipitation separates dissolved ions by raising a reagent's concentration gradually, so the least-soluble compound's Q exceeds its Ksp first, leaving other ions dissolved.
In practice
Adding chloride slowly to a solution with both Ag+ and Pb2+ precipitates AgCl first, well before enough accumulates to precipitate PbCl2.
Where people slip
This depends on a meaningful Ksp gap — near-identical Ksp values will not separate cleanly.
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