End-of-Chapter Material

1. What is the conjugate acid of HSO₄^–?
2. What is the conjugate base of HBr?
3. Write the balanced chemical equation between Ca(OH)₂ and HCl(aq).
4. Write the balanced chemical equation between KOH and HNO₃(aq).
5. Write the balanced chemical equation between aluminum hydroxide and sulfuric acid.
6. Write the balanced chemical equation between phosphoric acid and barium hydroxide.
7. Can an amphiprotic substance be a strong acid and a strong base at the same time? Explain your answer.
8. What is the pOH range for an acidic solution?
9. What is the pOH range for a basic solution?
10. The concentration of a solution that has a pH = 5.2?
11. The concentration of commercial HCl is about 12 M. What is its pH and pOH?
12. What is [OH^–] if {H₃O⁺] = 1.22 x 10^-4 M?
13. What could be used to make a buffer using the weak acid HCN?

1. H₂SO₄

3. Ca(OH)₂ (aq) + 2 HCl (aq) → 2 H₂O (l) + CaCl₂ (aq)

5. 2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O

7. As a strong acid or base, an amphiprotic substance reacts 100% as an acid or a base, so it cannot be a base or an acid at the same time.

9. pOH < 7

11. pH = −1.08; pOH = 15.08

13. Use the salt of HCN’s conjugate base. The conjugate base is CN^–, therefore salts such as NaCN, KCN, etc. would work.