Weak acid

In this episode of the 'Acids and Bases' course, we explore weak acids, a crucial category of acids that only partially dissociate in solution. Building on previous discussions of strong acids, this episode explains the characteristics of weak acids, their dissociation behavior, and their role in chemical equilibrium. You’ll learn about examples like acetic acid, how the acid dissociation constant (Ka) quantifies their strength, and their applications in natural and industrial processes. This episode lays the groundwork for understanding related topics like acid strength, conjugate acid-base pairs, and buffer systems.

Check your understanding

These are the same multiple-choice questions you will see in the Quiz section after you listen to the episode. Use them here to preview or review the answers.

What defines a weak acid?

  1. An acid that completely dissociates in solution.
  2. An acid that partially dissociates in solution.
  3. An acid with a very high pH.
  4. An acid that releases no hydrogen ions.
  5. An acid with a low Ka value.
  6. An acid that reacts violently with bases.

What is the chemical equilibrium for a weak acid like acetic acid?

  1. CH₃COOH → CH₃COO⁻ + H⁺.
  2. CH₃COOH ⇌ CH₃COO⁻ + H⁺.
  3. CH₃COOH + H₂O → CH₃COO⁻ + OH⁻.
  4. CH₃COOH + H₂O → CH₃COO⁻ + H₃O⁺.
  5. CH₃COOH → CO₂ + H₂O.
  6. CH₃COOH ⇌ CO₂ + H₂O.

How is the strength of a weak acid quantified?

  1. By its pH only.
  2. By its molar mass.
  3. By its acid dissociation constant (Ka).
  4. By its boiling point.
  5. By its reaction speed with bases.
  6. By the size of its hydrogen atoms.

Which of the following is an example of a weak acid?

  1. Hydrochloric acid (HCl).
  2. Sulfuric acid (H₂SO₄).
  3. Acetic acid (CH₃COOH).
  4. Citric acid (C₆H₈O₇).
  5. Carbonic acid (H₂CO₃).
  6. Sodium hydroxide (NaOH).

Why are weak acids significant in biological systems?

  1. They maintain blood pH through buffer systems.
  2. They are used to produce strong acids in cells.
  3. They catalyze enzymatic reactions.
  4. They serve as intermediates in metabolic pathways.
  5. They form non-reactive compounds in cells.
  6. They have no role in biological systems.

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