chromatogaphy Post lab questions 1. You are trying to determine a TLC solvent systemm that will separate the compounds A, B, and C. You ran the compounds on a TLC plate using hexanes/ethyl acetate 1:1 as the eluting solvent and obtained the chromatogram to the right. How could you change the solvent system to give better separation of these three compounds? 2. Consider a sample that is a mixture composed of biphenyl, ethyl benzoate, and benzyl alcohol. The sample is spotted on a TLC plate and developed in a hexanes/ethyl acetate solvent mixture. Predict the relative R f values for the three compounds in the sample. 3. If you are trying to separate a mixture of three compounds and all of the spots on a TLC plate are near the solvent front, would this be a good solvent to use for separation? What could you do to the mobile that would allow for a better separation? 4. What would happen to your column if you let the solvent drop below the top layer of sand? Explain.