Introduction to Solubility Equilibria

AP Chemistry· difficulty 4/5

A solution contains 0.10 M Ag+, Pb2+, and Cu+. Cl- is added slowly.

Which ion precipitates first?

A
$Pb2+$
B
$All precipitate simultaneously$
C
$Ag+$
check_circle
D
$Cu+$

Explanation

For 1:1 salts (AgCl and CuCl), the [Cl-] needed = Ksp/[M+]. Ag+ requires [Cl-] = 1.8e-9 M, Cu+ needs 1.7e-6 M. Ag+ precipitates first because it requires the least Cl-.

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