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Learning objective

Calculate and interpret Rf values.

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

Calculate and interpret Rf values

  • This point belongs to Chromatography (A-level only), especially Chromatography (A-level only).
  • You need to be able to calculate and interpret Rf values.
  • The key ideas to know are Rf value.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Rf value

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

What is the Rf value of a compound that travels 5 cm while the solvent front travels 10 cm?

Direct answer

The Rf value is calculated as the distance traveled by the compound divided by the distance traveled by the solvent front.

Key terms

  • Chromatography: A technique used to separate mixtures into their individual components based on their movement through a stationary phase.
  • Solvent front: The furthest point reached by the solvent in chromatography, used as a reference for calculating Rf values.

Common trap

Incorrect Rf value calculation: Always ensure to use the distance traveled by the compound in the numerator and the distance traveled by the solvent front in the denominator.

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