Thin-Layer Chromatography Practice Test

Which of the following can be determined from thin layer chromatography results?

I. Number of components in the mixture

II. The identity of the components

III. Polarity of components

After performing a TLC experiment, a researcher determines the Rf value of a component to be 2. He also notes that the solvent travelled a distance of 4cm on the plate. What can you conclude about this experiment?