CHEM 2541 Lecture Notes - Lecture 3: Separatory Funnel, Diethyl Ether, Stopcock
24 Dec 2019
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3: separation of a carboxylic acid (rco2h) & a phenol (aroh) Liquid-liquid extraction involves partitioning compounds in a mixture between two immiscible phases (an organic phase and an aqueous phase) based either on differences in the compounds" acid-base properties or their solubilities in the two phases. You will separate a mixture of benzoic acid (phco2h) and 2-naphthol (aroh) by liquid-liquid extraction based on the difference in their acidities (consult your lab lecture notes for details). 1st) you will prepare an ether solution (the organic phase) of the two compounds; any minor impurities are non-acidic and will remain dissolved in the organic phase throughout the extraction process. 2nd) you will extract benzoic acid from the organic (ether) phase into an aqueous phase by vigorously mixing the ether phase with an aqueous solution of nahco3 (a 10% solution of nahco3 (aq) has already been prepared for you).
