Samples of the coloured substances in two purple cleaning products, A and B, were analysed on the same chromatography paper using the same solvent.
The results for cleaning product A are shown in the table.
| Spot | Rf R_f\,Rf value |
|---|---|
| 1 | 0.24 |
| 2 | 0.53 |
| 3 | 0.78 |
The solvent moved 80.0 mm. The results for cleaning product B are shown in the table.
| Spot | Distance moved by spot in mm\text{mm}mm |
|---|---|
| 1 | 19.2 |
| 2 | 42.4 |
| 3 | 57.6 |
Calculate the Rf R_f\,Rf value for each spot from cleaning product B.
A technician concludes that all three coloured substances in cleaning product A are also present in cleaning product B.
Evaluate the technician's conclusion.
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.