Chemistry / Unit 10 Chem 1922 short lesson, about 20 seconds
Precipitation as a Reaction Type
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The idea
A precipitation reaction exchanges ions between two soluble compounds, forming a product whose ions exceed its Ksp and drop out as a solid.
In practice
Mixing AgNO3 and NaCl exchanges ions; Ag+ and Cl− exceed AgCl's Ksp, so solid AgCl forms while Na+ and NO3− stay dissolved.
Where people slip
Not every ion exchange precipitates — one occurs only if some combination's Q exceeds its Ksp.
Your place on the trail
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