J. Chem. Educ. 2000, 77, 203-205

It has come to my attention that there are two errors in my article, "Computational Investigations for Undergraduate Organic Chemistry: Modeling a TLC Exercise to Investigate Molecular Structure and Intermolecular Forces". In Figure 1, the R_f values reported are inexplicably inconsistent with the theory of TLC (as pointed out elsewhere in the article), i.e., more polar solutes are expected to be more strongly adsorbed on silica, resist elution with the nonpolar solvent used (hexane) and hence be characterized by a smaller, rather than a larger, R_f value. Unfortunately, the student work from which this figure was prepared is no longer available. In addition, on page 205, the eighth sentence in the section Materials should read (correction in bold italics); "Students are reminded that the polar substances are not expected to elute with the nonpolar solvent, and that the solvent mixture may be needed to differentiate between compounds of similar polarity."