A student separated three dyes, E, F and G, from a mixture using paper chromatography. The solvent moved 10.0 cm up the paper.
Table: The distance moved by each of the three dyes, E, F and G, on the student's chromatogram
| Dye | Distance moved by the dye in cm |
|---|---|
| E | 2.4 |
| F | 5.5 |
| G | 8.1 |
Use Table.
Calculate the Rf R_f\,Rf value of dye F.
Use the equation:
RfR_fRf = distance moved by the substance / distance moved by the solvent
Use Table.
Give the letter of the dye that is most strongly attracted to the paper.
Give one reason why an Rf R_f\,Rf value has no unit.
40 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.