LAB 3 - CAFFEINE

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5 Terms

1
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Before starting Step 3 of the procedure, you are asked to cook your aq solution to room temperature. Explain why cooling of the aq solution is necessary before adding DCM to it.

It’s important because DCM is a low boiling solvent and if it’s high DCM can create pressure inside the separating funnel

2
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Give examples of two other solvents that can be used for successful extraction of caffeine from tea/coke of DCM and explain your choices

Diethyl ether and ethyl acetate because they’re similar in polarity to caffeine (non-polar) and I’m immiscible with water

3
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In Step 4 of the procedure, which layer is aq and which layer is organic in the separatory funnel and why?

Aq = the top

Organic = DCM (bottom)

4
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What is the purpose of Step 5 of the procedure (repeat extraction with another 8 mL DCM?)

To make sure the maximum caffeine is extracted from the aq tea solution

5
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Show TLC sketch and calculate Rf value for your isolated caffeine and Rf value for control caffeine sample.

Rf = 0.4 / 0.7 = 0.5714