Monday 10 July 2017

1.13: Practical: Investigate Paper Chromatography using Inks / Food Colourings



PAPER CHROMATOGRAPHY
Diagram showing the Paper Chromatography of Ink and Plant Dye

USE: To separate substances that have different solubilities in a given solvent (E.g Different coloured Inks mixed to form black ink)

METHOD:

  • Pencil line is drawn on chromatography paper and a concentrated spot of ink/dye is placed on it
  • PPaper is lowered into bucket of solvent, allowing solvent to travel up the paper taking particles of coloured substance with it
  • Allow chromatography to occur until solvent reaches top of paper

RESULTS:

  • As solvent travels up the paper, different substances have different solubilities so will travel at different rates, causing substances to spread apart
  • This will show the different components of the ink/dye

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