1.8 explain how information from chromatograms can be used to identify the composition of a mixture.

When chromatography paper is placed in a solvent, the different compounds will travel at different speeds due to the size of their molecules

RF value = distance moved by the compound / distance moved by the solvent

  1. draw a line in pencil called : the base line on chromatography paper ( You should use carbon as id doesn’t dissolve easily into any solvent
  2. Place a small drop of the sample on the base line of the chromatography paper
  3. Place chromatography paper in suitable solvent – the solvent should not touch the sample on the paper 
  4. Allow the solvent to rise up from the paper and dissolve the sample and to spread out the parts of the mixture on the chromatography paper
  5. Remove the chromatography paper from the beaker and allow the solvent to evaporate
  6. Interpret the chromatogram by calculating the different RF values

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