posted by Lucy .
Okay, I know I asked this before (a while ago), except I lost the link to my original question and the answer to it...
What property of liquids and solids is crucial in chromatography?
The main one is the solubility of the compounds to be separate in the mobile and stationary phases. Of course, that involves the ionic/covalent character of the solvent as well as the stationary phase and the compounds themselves.