A conservator used paper chromatography to analyse a coloured substance removed from a piece of fabric.
The measurements were taken from the bottom edge of the chromatography paper.
| Feature | Distance from the bottom edge in mm |
|---|---|
| Origin line | 18.0 |
| Centre of the substance spot | 61.0 |
| Solvent front | 83.0 |
Calculate the Rf R_f\,Rf value of the substance.
Give your answer to 3 significant figures.
113 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.