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鲁科版必修1“硝酸的氧化性实验”探究中,实验装置比较简单,虽然也考虑到了尾气的吸收处理,但是不能随时控制反应的发生和停止,并且仍然会有部分有毒气体排出。笔者通过教学实践对该实验做了如下改进。一、实验仪器及试剂试管、橡胶塞、注射器、细铁丝、铁片、铜片、稀硝酸、浓硝酸、氢氧化钠溶液。二、实验装置及其组装说明实验装置如附图所示。组装说明:用针在橡胶塞上扎一小孔,将细铁丝穿进小孔,并在下端拴一小块铁片(或铜片)。说明:橡胶塞可以用小刀切去一截,这样打孔时方便操作,也有利于实验时上下移动铁丝。
Luke Edition compulsory 1 “nitric acid oxidation experiment ” exploration, the experimental device is relatively simple, although taking into account the exhaust gas absorption treatment, but can not always control the reaction occurs and stop, and still some of the toxic gas emissions. The author made the following improvements to the experiment through teaching practice. First, the experimental apparatus and reagents Test tube, rubber stopper, syringe, thin wire, iron, copper, dilute nitric acid, concentrated nitric acid, sodium hydroxide solution. Second, the experimental device and assembly instructions Experimental device as shown in the figure. Assembly instructions: Use a needle in the rubber plug a small hole, the fine wire into the hole, and the bottom of a small piece of iron (or copper). Description: a rubber stopper can be cut with a knife, so easy to operate when drilling, but also conducive to moving the wire up and down experiment.