Paper 2 Required Practicals

Question 1

What is the practical to investigate how paper chromatography can be used to separate and tell the difference between coloured substances?

Answer 1

❶ draw a pencil line across the chromatography paper 1 to 2 cm from the bottom.
❷use a pipette or capillary tube to add small spots of each ink to the line on the paper.
❸place the paper into a container with a suitable solvent in the bottom.
❹allow the solvent to move through the paper but remove the chromatogram before it reaches the top.
❺allow the chromatogram to dry then measure the distance travelled by each spot and by the solvent.