1. Solubility Product Constant
Chemistry
Mrs. Coyle

2. Solubility Equilibrium
AgCl(s) ↔ Ag+ (aq) + Cl- (aq)
The concentration of AgCl (s) is constant and AgCl is a strong electrolyte (dissociates almost completely), so
Ksp = [Ag+] [Cl-]
Ksp is the solubility product constant

3. Note
The larger the Ksp the larger the solubility of the compound. (This comparison can be made when the ion ratios are equal).
Ex. Of the following, which is more soluble?
AgCl Ksp= 1.8x10-10
AgI Ksp= 8.3x10-17

4. Example:
Write the Ksp for:
CuS
BaSO4
SrCO3
AgI