ࡱ> NPMR%` Gbjbj"x"x @@!%~~~~JJJJ V  jnnnn111e g g g g g g $PhJ 1"111 ~~n 1~8ne 1e  g b ¯..JM Q  0 ] % ,1111111 s111 1111~~~~~~ Reflux A liquid reaction mixture is placed in a vessel open only at the top. This vessel is connected to a condenser, such that any vapors given off are cooled back to liquid, and fall back into the reaction vessel. The vessel is then heated vigorously for the course of the reaction. The purpose is to thermally accelerate the reaction by conducting it at an elevated temperature The advantage of this technique is that it can be left for a long period of time without the need to add more solvent or fear of the reaction vessel boiling dry as any vapour is immediately condensed in the condenser. In addition, as a given solvent will always boil at a certain temperature, one can be sure that the reaction will proceed at a constant temperature. By careful choice of solvent, one can control the temperature within a very narrow range. The constant boiling action also serves to continuously mix the solution, although a magnetic stirring rod mechanism is often used to achieve a uniform solution. This technique is useful for performing chemical reactions under controlled conditions that require substantial time for completion. If the heating rate has been correctly adjusted, the liquid being heated under reflux will travel only partly up the condenser tube before condensing. Below the condensation point, solvent will be seen running back into the flask; above it, the condenser will appear dry. The boundary between the two zones will be clearly demarcated, and a reflux ring or a ring of liquid will appear there. In heating under reflux, the rate of heating should be adjusted so that the reflux ring is no higher than a third to a half the distance to the top of the condenser. The temperature of a reaction in a refluxing mixture will be approximately the boiling point of the solvent used for the reaction.  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