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Extraction Lecture Handout - Extraction Experiment 3...

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Extraction Experiment 3
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Recrystallization Question If crystals don’t form during a recrystallization you should: A. give up and go home B. tell the TA C. scratch the inside of the glass flask to initiate crystallization D. add some more of the solvent and try again E. none of the above
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Extraction (Liquid-Liquid) Purification process that separates compounds based on ______________________________ _________________ Usually (not always) ______ + ______________ IMPORTANT: densities Let you determine which layer is which Example: water d = 1.00 g/mL ether d = 0.713 g/mL _______ will be top layer!
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Extraction: A Visual
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Distribution Coefficients The Scenario: Two students perform an extraction with diethyl ether (45 mL total) to remove a compound from an aqueous solution. The compound has a distribution coefficient (K) of 5. Student A extracts 3 times with 15 mL of ether each time. Student B extracts 1 time with 45 mL of ether. Which extraction method is more efficient?
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Calculations with Distribution Coe ff٠ cient
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Microscale Extraction For small volumes, a centrifuge tube and filter pipette is more efficient than a separatory funnel.
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