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Cambridge IGCSE chemistry

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  1. States of matter
    States of matter
    3 Topics
  2. Changing state
    5 Topics
  3. Diffusion
    4 Topics
  4. Experimental techniques
    Taking measurements
    4 Topics
  5. Separation and purification
    4 Topics
  6. Chromatography
    2 Topics
Cambridge IGCSE chemistry Chromatography What is chromatography ?
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Lesson 6, Topic 1
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What is chromatography ?

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What is chromatography ?

 Chromatography is used to separate a mixture of soluble substances and   identify   them

  • In paper chromatography a spot of the test substance is added to chromatography paper. It is put on a baseline which is drawn with pencil. Then the end of the paper is placed in a solvent, with the solvent just above the baseline

  • The solvent travels up the paper and carries the test substance with it. The furthest point the solvent reaches is called the solvent front

  • Different substances will move up the paper at different rates 

  • Some will stick to the paper and others will dissolve more readily in the solvent and travel more quickly

  • The resulting pattern is called a chromatogram

Example

Which suspected components (A, B or C) are present in the sample (x)?

Answer:

A 

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