Start learning →

AP Chemistry Acid-Base Equilibria — practice questions

Explore 22 free Acid-Base Equilibria questions in AP Chemistry Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

Practise Acid-Base Equilibria with Quill →

Acid-Base Equilibria questions and exercises with answers

Showing questions 1–22 of 22.

When an acid donates a proton, the species left behind is called its:Read the answer and worked solution →The reaction between a Bronsted-Lowry acid and water is called:Read the answer and worked solution →A species that can either donate or accept a proton is described as:Read the answer and worked solution →The process in which like molecules react with each other to yield ions is called:Read the answer and worked solution →The equilibrium constant for an acid is known as the:Read the answer and worked solution →Compared with pure water, an acid solution has a hydroxide ion concentration that is:Read the answer and worked solution →At 25 degrees Celsius an acidic solution has a hydronium ion molarity:Read the answer and worked solution →At 25 degrees Celsius a basic solution has a pH value:Read the answer and worked solution →At a temperature where neutral water has pH 6.31, an acidic solution has a pH:Read the answer and worked solution →Normal rainwater is slightly acidic, with a pH between:Read the answer and worked solution →Acid rain is defined as rainwater with a pH of less than:Read the answer and worked solution →An acid is classified as strong when it undergoes:Read the answer and worked solution →The acid ionisation constant of a strong acid is described as:Read the answer and worked solution →Ordering acetic acid and nitrous acid by increasing strength gives:Read the answer and worked solution →Unlike Ka, the percent ionization of a weak acid typically changes when:Read the answer and worked solution →Gay-Lussac concluded that acids and bases can be defined:Read the answer and worked solution →Bicarbonate demonstrates amphiprotic behaviour because it can react with water as:Read the answer and worked solution →Acidic or basic at 25 C?Read the answer and worked solution →Match each acid-base termRead the answer and worked solution →True or false: acids and basesRead the answer and worked solution →Sort each gas by the acid it makesRead the answer and worked solution →Complete the strength ruleRead the answer and worked solution →

Worked practice questions

When an acid donates a proton, the species left behind is called its:

  1. Conjugate base
  2. Conjugate acid
  3. Spectator ion
  4. Reducing agent
Show answer and solution

Correct answer: A. Conjugate base

1. A Bronsted-Lowry acid is a proton donor. 2. When an acid donates a proton, the species that remains is called the conjugate base of the acid. 3. It gets that name because it reacts as a proton acceptor in the reverse reaction. 4. The conjugate acid is what a base becomes after accepting a proton. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 14 'Acid-Base Equilibria', sections 14.1-14.7_

Open this question →

The reaction between a Bronsted-Lowry acid and water is called:

  1. Acid ionization
  2. Acid precipitation
  3. Acid neutralisation
  4. Acid crystallisation
Show answer and solution

Correct answer: A. Acid ionization

1. Water can act as a proton acceptor toward an acid. 2. The reaction between a Bronsted-Lowry acid and water is called acid ionization. 3. It produces hydronium ions and the acid's conjugate base. 4. Neutralisation instead pairs an acid with a base to give a salt and water. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 14 'Acid-Base Equilibria', sections 14.1-14.7_

Open this question →

A species that can either donate or accept a proton is described as:

  1. Non-protic
  2. Amphiprotic
  3. Monoprotic
  4. Diprotic
Show answer and solution

Correct answer: B. Amphiprotic

1. Some species can play either role depending on their partner. 2. Species capable of either donating or accepting protons are called amphiprotic. 3. More generally they are called amphoteric, a term used for acids and bases under other definitions too. 4. Bicarbonate is the standard example, reacting as an acid with water in one equation and as a base in another. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 14 'Acid-Base Equilibria', sections 14.1-14.7_

Open this question →

How to practise

  1. Choose a Acid-Base Equilibria question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Chemistry topics

Composition of Substances and SolutionsEquilibria of Other Reaction ClassesSolutions and ColloidsStoichiometry of Chemical ReactionsThermodynamicsAtoms, Molecules, and IonsChemical Bonding and Molecular GeometryElectronic Structure and Periodic Properties