Practice: Which of the following compounds will become more soluble in basic solution?
a) PbF2 (s)
b) ZnCl2 (s)
c) Al(OH)3 (s)
d) MgCO3 (s)
Common Ion Effect occurs when an ionic solid is dissolved in a solution containing ions common to it,
Concept #1: Common Ion Effect on Solubility
Solubility of an ionic solid decreases in the presence of common ions.
Example #1: Determine molar solubility of CuCO3 (Ksp = 2.4 x 10-10) in 0.15 M MgCO3 solution.
Concept #2: Common Ion Effect: Acids & Bases
Solubility of base decreases in presence of OH- ions, while solubility of acid decreases in presence of H+ ions.
Example #2: Find solubility (g/mL) of Cr(OH)3 (Ksp = 6.7 x 10-31) if the solution is buffered at pH of 8.4 at 25ºC.
Practice: Which of the following compounds will become more soluble in basic solution?
a) PbF2 (s)
b) ZnCl2 (s)
c) Al(OH)3 (s)
d) MgCO3 (s)
Practice: A solution of Ba(OH)2 has a Ksp of 5.0 x 10−3.
i) Determine the pH of this solution.
ii) Determine the pH if Ba(OH)2 was added to a solution containing 3.2 M of BaF2 and 0.94 M of Al(OH)3.
