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Question 2: In order to extract isobutyric acidfrom a solution of diethyl ether, one shouldwash the solution with:A. One 30 mL wash of waterB. Three 10 mL washes of waterC. One 30 mL wash of hexaneD. Three 10 mL washes of hexane |
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Answer» Isobutyric acid has a carboxylic acid group, which is polar, and can readily hydrogen bond. It can be extracted from the organic solvent diethyl ether by washing with a polar solution like water. Multiple small volume washes extract better than one large volume wash. Use of a second organic solvent, hexane, will not extract the isobutyric acid from the diethyl ether. A. One 30 mL wash of water, incorrect. Multiple smaller volume washes will yield higher extraction results. B. Three 10 mL washes of water, correct. Isobutyric acid will enter the aqueous layer and wash off of the organic layer of diethyl ether. C. One 30 mL wash of hexane, incorrect. Hexane is another organic solvent like diethyl ether. D. Three 10 mL washes of hexane, incorrect. See C. |
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