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