TLC1 discussion and questions

TLC1 discussion and questions - Patrick Browne Section 102,...

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Patrick Browne Section 102, Karen Dehnert Thin Layer Chromatography In picking the two solvents we would use for part 2, we looked first and foremost at how spread out the spots were on each of the four solvents. The solution made up of 60:40 hexane: ethyl acetate was evidently not polar enough as none of the spots traveled very far from where they started. Therefore, we decided not to use this solution. All three of the other solutions had fairly spread out marks. Also, all three were easily visible under the U.V. light so this did not rule anything out. However, we noticed that the relative order was the same in every one of the solutions except for the 92:8 ethyl acetate: acetic acid solution (mine) where the caffeine traveled further than the Tylenol. Although this probably wasn’t the solution’s fault, we didn’t have any more ideas so we decided to discard that solution and go with the 100% ethyl acetate and 10:10:1 toluene: ethyl acetate: acetic acid solutions. Identifying our unknown was not difficult as we had Excedrin. Excedrin is made
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This note was uploaded on 11/14/2011 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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TLC1 discussion and questions - Patrick Browne Section 102,...

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