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一、改进目的防止反应时溴蒸气,苯蒸气的逸出,避免对室内空气的污染. 二、改进特点1.实验装置微型化,操作简便,易于推广. 2.整个实验是在密闭中进行,用沾有四氯化碳小棉团吸收反应过程逸出的溴蒸气. 3.药品用量少(2 ml苯、0.4ml液溴) 4.用一束铁丝作催化剂,控制催化剂表面积,以控制反应速度. 5.用硝酸银试剂检验Br~-存在.用蓝色石蕊试纸检验H~+(以证明有HBr生成).
First, improve the purpose of preventing the reaction of bromine vapor, benzene vapor escape, to avoid indoor air pollution. Second, to improve the characteristics of 1. Experimental device miniaturization, easy operation, easy to promote. 2. The entire experiment is carried out in a closed, The small amount of carbon tetrachloride stained with carbon tetrachloride absorbs the bromine vapor that escapes from the reaction process. 3. The amount of the drug is small (2 ml of benzene, 0.4 ml of liquid bromine). 4. Use a bundle of iron wire as catalyst to control the surface area of the catalyst to control Reaction rate. 5. Check the presence of Br~ with silver nitrate reagent. Test the H~+ with blue litmus paper (to prove that HBr is generated).