A conservation scientist uses paper chromatography to compare dyes removed from a coloured textile. Dyes K and L are placed on the same paper and separated using the same solvent. Dye K is more soluble in the solvent than dye L, but both dyes are equally attracted to the paper.
Why is dye K likely to have a higher Rf R_f\,Rf value than dye L?
Dye K spends more time dissolved in the moving solvent, so it is carried further.
Dye K stays dissolved in the solvent all the time, so it moves as fast as the solvent.
Dye K causes the solvent front to travel less far, so its ratio is increased.
Dye K spends more time attached to the stationary paper, so the solvent passes it.
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.