How does polarity of the solvent affect the Rf value? I was going over a problem in my book that said that polarity would increase the Rf value of both the polar and nonpolar analyte due to increased solubility. This doesn't make sense to me because wouldn't the solubility of the nonpolar analyte decrease thus, based on that explaination, only the Rf value of the polar molecule would increase and the Rf value of the nonpolar solvent should decrease right? Also, how does solubility of the solvent affect the Rf value if we only have a small pool of solvent at the bottom of the TLC plate? Does it somehow allow more compounds to move up the paper?