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Unformatted text preview: one or two extractions using a correspondingly greater volume of ether each time. The ethereal extracts are then united, dried with a suitable drying agent and filtered. The filtrate is then cautiously distilled, the ether being first distilled and finally the organic compound if volatile: if the compound is solid, the crude residue is puri-fied by recrystallisation. Very great care must be taken on all occasions when ether is distilled, because of the risk of fire or of an explosion: full experimental details for this operation are given, both on p. 80 (Preparation of Ether) and on p. 164 (Pre-paration of Aniline). Continuous ether extraction and continuous chloroform extraction. When a substance X is shaken up with ether and water it will distribute itself according to the relative solubilities in each solvent. ^, _ , . . rr - ^ Cone, in ether layer Thus K (partition coefficient) = ~-. vr Cone, in aqueous layer...
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- Fall '06
- Organic chemistry