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Extraction - 2 H and a neutral compound(R-H You should...

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ORGANIC CHEMISTRY LANEY COLLEGE CHEM 12A Extraction Reading: Experiment 3 in Pavia (Parts A and D only). Read also the Required Reading shown on p. 27. This includes Techniques 10 and 12 and optionally the Essay on Caffeine. (Read Section B in Technique 10 very carefully!) This is a technique experiment. The purpose of this experiment is to use extraction as a means to isolate caffeine (Part A) and as a means to separate a mixture of organic compounds – in this case a carboxylic acid (R-CO 2 H) and a neutral compound (R-H)(Part D). You will learn to use a separatory funnel to separate immiscible liquids, how to perform extractions, how to wash solutions, and some of the fundamentals about filtering solutions. Prelab Include your Name , the Date , a Title , Purpose and an Outline of the procedure for Parts A and D. Additionally, you need to show the Prelab Calculation for Part A (p. 27) and a Separation Scheme for Part D (for example of this see: Pavia p. 580 and 719). In this case, show a generalized separation of a carboxylic acid (R-CO
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Unformatted text preview: 2 H) and a neutral compound (R-H). You should definitely review fundamental acid/base chemistry and understand the role of the drying agent for both parts. Procedure Follow the procedure for PartA and Part D of the experiment. Of the neutral compounds shown in the Table on p. 34 of Pavia only three are possible in our experiment: fluorene, fluorenone and triphenylmethanol. To Complete the Experiment Determine the mp of your isolated caffeine and report your yield (in grams—you can’t calculate a percent yield for this one) and compare with the amount calculated in the prelab calculation. Identify the neutral compound that was present in your original mixture by its mp. From you recorded weight of the neutral compound calculate the percentage by weight of the material in the original mixture (i.e., something ~ 0.36 g). Version 2.3, 9/15/07...
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