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化学实验习题中有很多学生模棱两可、不清楚的地方,现将它们辨析如下.1.氢氧化钠固体保存在配有橡胶塞的细口瓶中.(错)解析:氢氧化钠固体应保存在广口塑料瓶或玻璃瓶(橡胶塞)中,密封放在干燥处·2.溴水盛放在配有橡胶塞的细口瓶中.(错)解析:溴水会腐蚀橡胶塞,应保存在配有玻璃塞的细口瓶中.一般液体及挥发性物质保存在细口瓶中,因见光易分解的试剂,还应用棕色瓶,如:浓硝酸、硝酸银、卤化银、氯水、溴水、碘
There are many students in the chemical experiment ambiguous, unclear, now they are identified as follows.1. Sodium hydroxide solid stored in a rubber stopper with a small bottle. (Wrong) Resolution: sodium hydroxide solid should be stored in Wide mouth plastic bottle or glass bottle (rubber stopper), sealed in a dry place · 2. Bromine water in a small bottle filled with rubber stopper (wrong) Analysis: Bromine will corrode the rubber stopper should be preserved In glass vials with glass stoppers, liquids and vapors are typically stored in small jars because of easy decomposition of light and use of brown bottles such as concentrated nitric acid, silver nitrate, silver halide, chlorinated water , Bromine water, iodine