Quiz 4 (10 pts)
Chemistry 163 – Price
Name __________________________
1. (3 points) Write the ion-product (equilibrium) expression for each compound:
a. Calcium sulfate
b. Chromium(III) carbonate
c. Aluminum oxide
2. (2 points) Does any solid form when 7.5x10-3 g of sodium fluoride is dissolved in
500.mL of 0.023 M of calcium nitrate (calcium fluoride Ksp = 3.2 x 10-11 )? If yes, how
many grams of solid form? SHOW WORK!
3. (2 points) What are the concentrations of ions in the resulting solution from 2 above?
(Hint: the concentrations will be different depending on whether or not solid calcium
fluoride formed!)
a. calcium ___________
b. fluoride _____________
4. (1 point) What would happen to the ion concentrations in the solution above if an acid
(H+) were added?
5. (2 points) Barium Sulfate is used to X-ray the GI tract. Which solution do you expect to
have the higher concentration of barium ions in solution? Circle your answer and explain
why? (Ksp = 1.1 x 10-10) No calculations are needed for this.
a. In pure water
b. In 0.30 M Na2SO4