有机化学实验复习(国外英文资料).doc

有机化学实验复习(国外英文资料) Review of Organic Chemistry Experiments 1. when measuring the melting point, where should the mercury bulb of the thermometer be located? Where should a mercury bulb of a thermometer be placed at atmospheric distillation? Where should the mercury bulb of the thermometer be located during the preparation of ethyl acetate? Answer: the melting point of the two sides of the pipe central tube. On the head of the central water distillation, the second upper and lower limit of the distillation flask branch at the same level. The surface below. 2. the working principle of Soxhlet extractor, Soxhlet extractor than conventional heating reflux extraction what are the advantages? Answer 1: Soxhlet extractor using reflux and solvent composition of siphon principle, need a solid mixture by continuous extraction. When the liquid level Straw rainbow tube in the extraction solvent than Soxhlet extractor, extraction solvent into the round bottom flask in the cylinder, the siphon. The temperature, reflux again, each siphon before the solid material can be pure hot solvent by solvent extraction, repeated use, shorten the extraction time, the extraction efficiency compared with ordinary high heating reflux. 3. many reactions (or processes) are exothermic. Please give examples of the specific examples (at least three) of organic chemistry experiments this semester, and briefly explain how you solved these heat release problems. Answer: 2- methyl -2 hexanol preparation of n-butyl bromide, preparation of furoic acid and preparation of furfuryl alcohol. Cooled by ice bath or condensed with a condensing tube. 4. what are the purposes of using a split funnel? What items should be paid attention to when using a split funnel? Answer 1: using a separatory funnel to use liquid proportion, fast hierarchical. Note: use the separatory funnel to the attention of the upper and lower piston supporting, oiling and leak proof, at the beginning of each shake slowly, shaking, should no pla