Chem 353-21

Chem 353-21 - trichlorobenzene are 0.06, 11.2, and 1.4...

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Post Lab Questions – Caffeine Isolation (You may write the answers only in your notebook for the post lab questions if you choose.) 1. Using a chemical equation, explain the purpose of the sodium carbonate used during the isolation of caffeine from tea leaves. 2. According to the techniques manual (technique 16), what are the four criteria that must be satisfied in order to successfully use sublimation to purify an organic compound. 3. The vapor pressures of 1,2-diphenylethane, p-dichlorobenzene, 1,3,5-
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Unformatted text preview: trichlorobenzene are 0.06, 11.2, and 1.4 torr, respectively, at their melting points (52-54 o C). Explain which compound is likely to be sublimed most rapidly at a reduced pressure of 15 torr and a temperature of 40 o C. 4. (Complete your caffeine spectral analysis before proceeding.) Assign the labels (A-D) on the structure below to the appropriate signals in the proton spectrum. What solvent was used to prepare this sample?...
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This note was uploaded on 04/06/2011 for the course CHEM 353 taught by Professor Bronson during the Winter '11 term at BYU.

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