AP Chemistry Unit 8 practice questions: Acids and Bases
8 original multiple-choice questions on AP Chem Unit 8, acids and bases. Answer each one in your browser and read the explanation, then review the key ideas below.
Question 1 of 8
What is the pH of a 0.010 M HCl solution?
Question 2 of 8
Which pair could be used to make a buffer?
Question 3 of 8
At 25 °C, a solution has [H⁺] = 1 × 10⁻³ M. What is its pOH?
Question 4 of 8
What is the pH of a 0.0010 M NaOH solution at 25 °C?
Question 5 of 8
During the titration of a weak acid with a strong base, what is the pH at the half-equivalence point?
Question 6 of 8
What is the conjugate base of H₂PO₄⁻?
Question 7 of 8
Which acid is strong?
Question 8 of 8
Which weak acid is the strongest? HF (Ka = 6.8 × 10⁻⁴), CH₃COOH (Ka = 1.8 × 10⁻⁵), HClO (Ka = 3.0 × 10⁻⁸), HCN (Ka = 6.2 × 10⁻¹⁰)
Key ideas in Unit 8
- pH = −log[H⁺], pOH = −log[OH⁻], and pH + pOH = 14 at 25 °C.
- Strong acids and bases ionize completely; weak ones are described by Ka or Kb, and a larger Ka means a stronger acid.
- Conjugate acid-base pairs differ by one H⁺.
- Buffers contain a weak acid and its conjugate base and resist pH change; at the half-equivalence point of a weak acid titration, pH = pKa.
- Titration curves show the equivalence point; a weak acid with a strong base has an equivalence pH above 7.
More AP Chem practice
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