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Learning objective

Identify conjugate acid-base pairs.

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Topic

Acids and bases (A-level only)

Subtopic

Brønsted-Lowry acids and bases (A-level only)

Aqa A Level ChemistryPhysical chemistry

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Quick explanation

Identify conjugate acid-base pairs

  • This point belongs to Acids and bases (A-level only), especially Brønsted-Lowry acids and bases (A-level only).
  • You need to be able to identify conjugate acid-base pairs.
  • The key ideas to know are pairs, acid-base, and conjugate.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

pairsacid-baseconjugate

Why it matters

This objective helps connect Brønsted-Lowry acids and bases (A-level only) to exam-style questions, flashcards, and revision notes for Acids and bases (A-level only).

Quick student answer

Which of the following pairs represents a conjugate acid-base pair?

Direct answer

HCl and Cl⁻

Key terms

  • Conjugate acid: The species formed when a Brønsted-Lowry base gains a proton.
  • Conjugate base: The species formed when a Brønsted-Lowry acid loses a proton.

Common trap

Confusing conjugate acids and bases: Remember that the conjugate acid is formed when a base gains a proton, while the conjugate base is formed when an acid loses a proton.

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