Last Updated on April 21, 2025
AP Chemistry Unit 8 Practice Test 2025 Acids and Bases. These are the sample questions and answers on the Unit 8 Acids and Bases AP Chemistry exam. You can try both Multiple-Choice Questions and answers, as well as free-response questions. This unit is 11–15% of the Advanced Placement (AP) Exam score.
These multiple-choice questions pertain to pH, the properties and characteristics of acids and bases, and their interactions in chemical reactions.
AP Chemistry Unit 8 Practice Test
Free-Response Questions
Propanoic acid, CH3CH2COOH, has an acid ionization constant of Ka = 1.3 × 10–5. Ammonia, NH3, has a base ionization constant of Kb = 1.8 × 10–5.
(a) Write the balanced equation for the reaction of propanoic acid, CH3CH2COOH, with ammonia.
(b) Identify the two conjugate acid–base pairs.
(c) Does the equilibrium position lie on the reactant or the product side of the equation when equal moles of propanoic acid and ammonia are mixed? Justify your choice.
(d) Of the two acids in your equation, which is stronger and why?
(e) Of the two bases in your equation, which is stronger and why?
(f) Using appropriate scientific reasoning, state why you would conclude that one binary acid is stronger than another. Give a relevant example.
(g) Using appropriate scientific reasoning, state why you would conclude that one oxoacid is stronger than another. Give a relevant example.
See also:
Unit Wise Practice Test- Unit 1: Atomic Structure and Properties
- Unit 2: Compound Structure and Properties
- Unit 3: Properties of Substances and Mixtures
- Unit 4: Chemical Reactions
- Unit 5: Kinetics
- Unit 7: Equilibrium
- Unit 8: Acids and Bases
- Unit 9: Thermodynamics and Electrochemistry