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Explain how paper chromatography can be applied to separate mixtures of soluble colorless substances using a suitable solvent and a locating agent, without needing to know specific locating agents.

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Cambridge IGCSE ChemistryExperimental techniques and chemical analysisSupplement content

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Quick explanation

Explain how paper chromatography can be applied to separate mixtures of soluble colorless substances using a suitable solvent and a locating agent, without needing to know specific locating agents

  • This point belongs to Chromatography, especially Chromatography outcomes.
  • You need to be able to explain how paper chromatography can be applied to separate mixtures of soluble colorless substances using a suitable solvent and a locating agent, without needing to know specific locating agents.
  • The key ideas to know are Describe, Explain, and Use.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DescribeExplainUse

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This objective helps connect Chromatography outcomes to exam-style questions, flashcards, and revision notes for Chromatography.

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Paper 4 structured question: Chromatography

Paper 4Theory (Extended)1 marks

Description

Paper Chromatography Process

In this process, a small spot of the mixture is placed on chromatography paper. A solvent is then allowed to move up the paper, carrying the components of the mixture with it. After the solvent has traveled a certain distance, a locating agent is applied to visualize the separated components.

  1. a

    State the purpose of a locating agent in paper chromatography.

    Aim for approximately 1 distinct marking point.

    [1]
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