Chemistry / Unit 10 Chem 1931 short lesson, about 20 seconds
Complexation's Effect on Solubility
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The idea
A ligand forming a strong complex with a dissolved metal ion pulls its free concentration down, dropping Q below Ksp and letting more solid dissolve.
In practice
Silver chloride, nearly insoluble in water, dissolves readily once excess ammonia forms Ag(NH3)2+, pulling free Ag+ below its limit.
Where people slip
The solid did not become more soluble — complexation removed the free ion the equilibrium measured.
Your place on the trail
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