3.Characterizationofunknowns - Characterization of Unknowns...

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Characterization of Unknowns Prelab Reading (from Mohrig, “Techniques in Organic Chemistry”) Technique 14 (Melting points and Melting Ranges) Technique 17 (Thin Layer Chromatography) Technique 20 (IR Spectroscopy) Procedure: Determine the melting point ranges of both the “basic extract” sample and the “organic extract” sample. Use the list of possible unknowns supplied in the lab to determine the most likely identity of each unknown. Then prepare mixed melting point samples based on your data and determine the range of each mixed melting point. Prepare TLC samples for both samples by dissolving about 5 mg of each sample with about 0.5 mL of acetone in two labeled test tubes. Apply the samples to the TLC plates provided, then develop the TLC plate in a 0.5% acetic acid/ethyl acetate solution. Visualize the spot(s) under a UV lamp and mark them with a pencil. Obtain an IR spectrum of each sample using the thin film method or KBr pellet method as directed by your AI.
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This note was uploaded on 01/18/2012 for the course CHEM S343 taught by Professor Benburlingham during the Summer '11 term at Indiana.

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3.Characterizationofunknowns - Characterization of Unknowns...

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