Composition of a mixture:
Chromatography paper is taken. A sample (unknown) is placed along the pencil line. Other known elements are placed beside the sample along the same line.
- Chromatograms will show the composition of a mixture as the different coloured substances (components) will spread apart as they will have different solubilities so will travel at different rates
- A pure substance will only produce one spot on the chromatogram during paper chromatography
- In the diagram shown, red, blue and yellow are three pure substances, whilst the sample on the left is a mixture of all three