Chemistry / Chem 1931 · Atom · ~20 seconds
Complexation's Effect on Solubility
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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.
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Silver chloride, nearly insoluble in water, dissolves readily once excess ammonia forms Ag(NH3)2+, pulling free Ag+ below its limit.
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The solid did not become more soluble — complexation removed the free ion the equilibrium measured.