The Common Ion Effect
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The Common Ion Effect
The concentrations of ions in solution are affected by all equilibria
and all species present in the solution. The simplest and most
significant such effect is called the common ion effect. The common ion
effect is observed whenever an ion in solution is common to two
different salts which serve as its sources. Addition of the second salt
adds the common ion, which is a product of the dissolution of the
first. The effect of adding the product ion will be to decrease the
solubility of the first salt.
If a salt M1xA1y (e.g. BaF2 : x=1, y=2) is added
into a solution already containing a common ion e.g. M2+m
(Ba+2), the expression for the solubility product will be:
Ksp=[M1+m+M2+m]x [A1-a]y
Solubility Product
Solubility In Water
Solubility Rules
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