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experiment 7 report.

experiment 7 report. - Jae Shin Experiment 7 TLC Discussion...

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Jae Shin 10/27/10 Experiment 7: TLC Discussion In narrowing the choice of TLC solvent systems for part II, we chose the two solvent systems that gave the best separation for the known compounds – we choose 100% ethyl acetate and 92:8 ethyl acetate and acetic acid because the spots observed from their TLC plates gave the best separation with moderately size spots under the UV for all four lanes and Iodine stains for three lanes and the spots did not line up with their origin. Our group correctly identified the unknown analgesic V as Ibuprofen. From the criteria stated above, we chose the above two solvent systems. Each of us out of four were given the unknown V and crushed to a powder. We each placed our entire crushed samples in a small test tube with 0.5mL of absolute ethanol and then mixed the solution using glass rod grinding motion. We each developed our own TLC plates, total of four with different compounds and the unknown as indicated in Table E7.1. From the TLC plate results, it was clear that from group number 1 and 2 TLC plate, the unknown V lane 2 had the similar Rf value at 0.73 – 0.76; the TLC plate
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