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Learning objective

Explain separation using stationary and mobile phases.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Topic

Chromatography (A-level only)

Subtopic

Chromatography (A-level only)

Aqa A Level ChemistryOrganic chemistry

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Quick explanation

Explain separation using stationary and mobile phases

  • This point belongs to Chromatography (A-level only), especially Chromatography (A-level only).
  • You need to be able to explain separation using stationary and mobile phases.
  • The key ideas to know are mobile phase.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

mobile phase

Why it matters

This objective helps connect Chromatography (A-level only) to exam-style questions, flashcards, and revision notes for Chromatography (A-level only).

Quick student answer

Which of the following statements correctly describes the role of the stationary phase in chromatography?

Direct answer

The stationary phase interacts with the analytes, causing some to move more slowly than others.

Key terms

  • Stationary Phase: The phase in chromatography that remains fixed in place and interacts with the analytes.
  • Mobile Phase: The phase in chromatography that moves through the stationary phase and carries the analytes.

Common trap

Confusing stationary and mobile phases: Remember that the stationary phase does not move and is responsible for the interaction with the analytes, while the mobile phase is what carries the analytes through the system.

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