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 that have been Mixed to Make Black Ink)

METHOD:

  • Pencil Line is Drawn on Chromatography Paper and Spots of Ink / Dye is Placed on it
  • Paper is Lowered into a Bucket of Solvent, Allowing the Solvent to Travel Up the Paper, Taking some of the Coloured Substances with it
  • Allow Chromatography to Occur until the Solvent Reaches the Top of the Paper

RESUTS:

  • As the Solvent Travels Up the Paper, Different Substances will have Different Solubilities so will Travel at Different Rates, Causing the Substances to Spread Apart
  • This will show the Different Components of the Ink / Dye

- http://igcse-chemistry-2017.blogspot.ae/2017/07/113-practical-investigate-paper.html

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