AP Chemistry Practice Exam 2 ❮ 363COMPOUND FORMULA KSP
Silver sulfate Ag 2 SO 4 1.6 × 10 -^5
Barium Sulfate BaSO 4 1.1 × 10 -^10
Calcium sulfate CaSO 4 9.1 × 10 -^6
Strontium sulfate SrSO 4 3.2 × 10 -^7Question 7
The solubility product constants for some insoluble sulfates are given in the table above.
(a) Write a balanced chemical equation for the dissolution equilibrium of silver sulfate, Ag 2 SO 4 , in water.
(b) A sodium sulfate solution is slowly titrated into a solution that is 0.10 M in Ba(NO 3 ) 2 and 0.10 M in
Sr(NO 3 ) 2.
(i) Show, with calculations, which salt will precipitate first, the barium salt or the strontium salt.
(ii) If the titration is continued, eventually the second salt will begin to precipitate. What is the con-
centration of the other ion (Ba^2 + or Sr^2 +) remaining in solution when the second salt begins to
precipitate?
(c) Show, with calculations, which of the solids in the table is the most soluble.STOP. End of AP Chemistry Practice Exam 2, Section II (Free Response).21-Moore_PE02_p341-370.indd 363 31/05/18 1:54 pm