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Chapter 15 | Equilibria of Other Reaction Classes 809
A saturated solution is a solution at equilibrium with the solid. Thus:
As with other equilibrium constants, we do not include units with Ksp. Check Your Learning
In a saturated solution that is in contact with solid Mg(OH)2, the concentration of Mg2+ is 1.31 10–4 M. What is the solubility product for Mg(OH)2?
Answer: 8.99 10–12
Example 15.3
Determination of Molar Solubility from Ksp
The Ksp of copper(I) bromide, CuBr, is 6.3 10–9. Calculate the molar solubility of copper bromide. Solution
The solubility product of copper(I) bromide is 6.3 10–9.
The reaction is:
First, write out the solubility product expression:
Create an ICE table (as introduced in the chapter on fundamental equilibrium concepts), leaving the CuBr
column empty as it is a solid and does not contribute to the Ksp:
At equilibrium:
Therefore, the molar solubility of CuBr is 7.9 10–5 M.
Check Your Learning
The Ksp of AgI is 1.5 10–16. Calculate the molar solubility of silver iodide.
Answer: 1.2 10–8 M
