A technician separated a colouring, S, from a confectionery sample by paper chromatography.
The distances were measured from the origin line.
| Measurement | Distance in cm |
|---|---|
| Centre of the spot produced by S | 3.6 |
| Solvent front | 9.0 |
The relationship used to determine an Rf R_f\,Rf value is:
Rf=distance moved by substancedistance moved by solventR_f = \dfrac{\text{distance moved by substance}}{\text{distance moved by solvent}}Rf=distance moved by solventdistance moved by substance
Calculate the Rf R_f\,Rf value for S.
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.