A scientist used paper chromatography to analyse a pigment in a spinach leaf extract. The pigment had an Rf R_f\,Rf value of 0.637 and the solvent front moved 7.45 cm from the origin line.
What is the distance moved by the centre of the pigment spot, to 3 significant figures?
2.70 cm2.70\ \text{cm}2.70 cm
11.7 cm11.7\ \text{cm}11.7 cm
0.0855 cm0.0855\ \text{cm}0.0855 cm
4.75 cm4.75\ \text{cm}4.75 cm
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.