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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Chromatography

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Chromatography

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Paper 4Theory (Extended)4 marks

In a laboratory experiment, a student uses paper chromatography to separate a mixture of colorless substances.

Description

Chromatography Experiment

The student places a spot of the mixture on chromatography paper and allows a solvent to move up the paper. After the solvent has traveled, a locating agent is applied to visualize the separated substances.

  1. a

    Explain how the process of paper chromatography separates the components of the mixture.

    Aim for approximately 4 distinct marking points.

    [4]

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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]