Acid-Base Mixture Problems
1. A solution is created by dissolving 0.159mol of lithium acetate, LiCH3CO2, in
450ml of 0.40M acetic acid, CH3COOH. (Ka = 1.8 x 10-5). Assume that the
volume of the solution does not change.
a. Find the pH of the solution.
b. Find the pH after 0.25 mol HNO3 is added to the solution. Assume that
the volume does not change.
2. A solution is created by dissolving 1.786g of potassium acetate, KCH3CO2, in
750ml of 0.345M acetic acid, CH3COOH, at 25C. Ka for acetic acid is 1.8 x 10-5
at 25C. Assume that the volume of the solution does not change.
a. Find the concentration of the acetate ion, CH3COO-, in the final
solution.
b. Find the concentration of acetic acid, CH3COOH, in the final solution.
c. Find the concentration of H+ in the final solution.
d. Find the pH of the final solution.
3. A solution is created by dissolving 4.3g of sodium fluoride, NaF, in 965.0 ml of
1.0M hydrofluoric acid, HF. (Ka = 7.2 x 10-4). Assume that the volume of the
solution does not change.
a. Find the concentration of the fluoride ion, F-, in the final solution.
b. Find the concentration of HF in the final solution.
c. Find the concentration of H+ in the final solution.
d. Find the pH of the final solution.
4. How many moles of HCN must be added to a 550 ml solution of 0.50M NaCN to
create a buffed solution with a pH of 9.5? (Ka = 6.2 x 10-10). Assume that the
volume does not change.
5. How many moles of KOCl must be added to a 550 ml solution of 0.35M HOCl to
create a buffed solution with a pH of 8.0? (Ka = 3.5 x 10-8) Assume that the
volume does not change.
6. What is the pH of a 0.50M solution of HF? What is the pH of a solution containing
0.50 M HF and 0.50 M NaF?
For the following reactions, write balanced net ionic equations.
7. Solid calcium hydroxide is placed in a solution of nitric acid.
8. Solid strontium carbonate is placed in a solution of sulfuric acid.
9. Solid beryllium hydroxide is placed in a solution of acetic acid.
10. Equal volumes of 0.2 M hydrobromic acid and 0.2 M lithium hydroxide are
mixed.
11. Equal volumes of 0.25 M acetic acid and 0.25 M potassium hydroxide are mixed.
12. Aqueous solutions of sodium acetate and hydrochloric acid are combined.
13. Solutions of ammonium nitrate and sodium cyanide are poured into a beaker.
14. Solid ammonium nitrate is added to water.
15. Solid potassium fluoride is added to water.