What would you expect to notice on the piece of chromatography paper after some time?
The ink spot is placed on the chromatography paper just above the level of the solvent.
Describe an experiment to investigate the composition of inks in markers containing water-soluble inks, to see if they are a single-colour ink or a mixture of coloured inks.
On completion of the experiment how is it possible to distinguish between a marker containing a pure single-colour ink and a marker containing mixture of coloured inks.
A spot of water-soluble ink was put on a piece of chromatography paper and set up as shown in the diagram. The ink used was a mixture of different coloured dyes.
What happens to the ink spot as the water moves up the paper?
What would happen to a spot of water-soluble ink consisting of a single coloured dye if it were used in the above experiment?
Paper chromatography was used to find the composition of brown ink in a pen.
The same liquid, paper and pen were used in each of the three experiments shown.
They were started at different times, C first then B and finally A.
Why is the ink dot above the level of the liquid in each beaker?
What caused the dots of ink on the papers B and C to spread upwards?