Experiment 3- Extraction.docx

Experiment 3- Extraction.docx - CHEM 223302 Expt.3 Pre-lab...

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CHEM 223302 Expt.3 Pre-lab I. Part 1 (Extraction: Separation of an Acidic, a Basic, and a Neutral Substance) o Density of extraction solvents Diethyl ether: 0.71g/ml 1. Add 3g of mixture that contains benzoic acid, 4-chloroaniline and naphthalene and 30ml of diethyl ether (= extracting solvent) to a 50ml Erlenmeyer flask. Record accurate weight of this mixture. (Take an extra care of diethyl ether; it’s highly flammable.) Swirl and stir a solution to make everything to dissolve completely. Transfer the solution to a separatory funnel using a little ether (= water) . Pour 10ml of water to a separatory funnel and observe/record the layer: which one is organic and which is aqueous? Then, add 10ml of 3M HCl. Stopper the funnel, invert it and open the stopcock to release the pressure that might have developed inside the separatory funnel. Alternate between gently shaking and venting by opening the stopcock. Toward the end of extraction, shake the funnel more vigorously to be sure the extraction is complete. 2. Wait few minutes to allow layers to separate completely. Place the separatory funnel in a ring clamp, then drain the lower layer to the 50ml Erlenmeyer flask labeled Flask A . Add another 5ml of water to the separatory funnel, shake the mixture as you did before. Drain this lower layer to
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