Experiment 7

Experiment 7 - Vanessa Chew Ashleigh Ward Chem 3AL November...

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Vanessa Chew Ashleigh Ward Chem 3AL November 7, 2010 Experiment 7: Identification of an adulterated herb or spice by TLC Discussion The data from Plate 4 showed that the adulterated sample, 728, contained the same compound as pure sample 727 did, as both had spots that visualized with I 2 at the same R f across the different solvent systems. In addition, 728 had an extra spot that was seen under UV and I 2 . Neither 725 nor 726 had spots corresponding to those of 728. This confirmed initial suspicions as both 727 and 728 smelled rather similar. Plate 5, which was spotted with 728, 727, and the suspected adulterant (sample 71), showed spots as expected. 727 showed a spot at the same R f as 728. Both spots were only visible with I 2 . In addition, the extra spot in 728 showed at the same R f , and was seen with both UV and I 2 , as that of 71. Smell was first used to narrow the list of possible adulterants. In addition to 728 smelling like coriander, a hint of anise was also detected. In conjunction with the TLC data, sample 71 was
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This note was uploaded on 11/29/2010 for the course CHEM 3AL taught by Professor Li during the Fall '08 term at Berkeley.

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Experiment 7 - Vanessa Chew Ashleigh Ward Chem 3AL November...

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