Learning Goal
To learn how to calculate the solubility from Ksp and vice versa. Consider the following equilibrium between a solid salt and its dissolved form (ions) in a saturated solution:
CaF2 (s) --> Ca + 2F
At equilibrium, the ion concentrations remain constant because the rate of dissolution of solid CaF2 equals the rate of the ion crystalllization. The equilibrium constant for the dissolution reaction is
Ksp = [Ca][F]2
Ksp is called the solubility product and can be determined experimentally by measuring the solubility, which is the amount of compound that dissolves perunit volume of saturated solution.
PartA
A saturated Solution of lead (II) fluoride, PbF2 in water. The concentration of Pb ion in the solution was found to be 2.08*10^-3 M
Calculate Ksp for PbF2
Part B
The Value of Ksp for silver carbonate, Ag2CO3, is 8.10*10^-12
Calculate the solubility of Ag2CO3 in grams per liter.