Abstract: . . .  8 The next step is to evaporate the solvents. Clean the 5 mL conical flask thoroughly, transfer the filtrate to it (pasteur pipet), and secure it to the air condenser tube. Holding it by the condenser, immerse it in hot water (about 80) and evaporate the cyclohexene and cyclhexane with a gentle stream of nitrogen from a pasteur pipet held about half an inch above the surface of the liquid. Regulate the flow of nitrogen before placing the pipet in the tube and conical flask, and approach the liquid surface gingerly. Too much gas will blow the liquid out of the flask into the tube, and you will have to rinse it down with cyclohexane and start over. Continue the evaporation until bout 0.5 mL of viscous . . .
. . .  thousands of years: olive oil is good for you. Unlike most plant oils such as soybean, corn, and safflower, which contain triglycerides made with polyunsaturated fatty acids, olive oil is almost pure glyceryl trioleate. It is unique in this respect. For our purposes, we can consider it to contain 80% oleic and 10% stearic acids, randomly distributed at the three OH groups in glycerol. Thus, olive oil solves the dietary problems inherent in other plant oils. It furnishes low- melting-point fatty acids, which do not produce arterial plaque, yet they cannot oxidize because they are monounsaturated. There are not trans fatty acids, and almost no unsaturated ones. THE EXPERIMENT We will use olive . . .
. . .  evaporated before taking this step. If it is not, the liquid may boil excessively when the vacuum is applied. Attach the Hickman still to the flask, seal the top of the still with a septum, and connect the side arm of the still of the vacuum line. Used this way, the still is simply a way to connect the flask to the vacuum line. Turn on the vacuum, and hold the flask in boiling water for 20 minutes to remove the last traces of solvent. Remove the flask from the water frequently, turn it on its side, and rotate it to spread the liquid over the inside surface of the flask. Finally, release the vacuum line, and cool the flask in ice. II. Characterizing the product Read Sorrell pp. 691 708 and Mohrig . . .
. . .  in hot water (about 80) and evaporate the cyclohexene and cyclhexane with a gentle stream of nitrogen from a pasteur pipet held about half an inch above the surface of the liquid. Regulate the flow of nitrogen before placing the pipet in the tube and conical flask, and approach the liquid surface gingerly. Too much gas will blow the liquid out of the flask into the tube, and you will have to rinse it down with cyclohexane and start over. Continue the evaporation until bout 0.5 mL of viscous oil remains (the initial volume of the olive oil before the cyclohexene was added). Finish the evaporation in vacuo. Almost all the solvent must be evaporated before taking this step. If it is not, the liquid may boil excessively . . .
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