Question

what is the Rf of an unknown sample that travels 15 mm where the solvent front travels 25 mm

Answer 1

15/25 right?

Answer 2

pretty sure that R\(_f\) value is the distance that one of the dyes traveled up the sheet of paper, compared to how far the solvent traveled. So take the distance the solvent traveled. Then take distance the sample traveled and divide distance traveled by the sample by the distance traveled by the solvent.

In other words: \(\sf R_f = \large \color{blue}{\frac{distance~of~sample}{distance~of~solvent}}\)

Answer 3

so I would just do 15 mm/25mm