论文部分内容阅读
一、实验目的鲁科版化学教材选修4第一章第二节活动与探究中要求学生利用U形管电解饱和食盐水并检验电解产物。在此实验中铁架台体积大、学生电源携带不便、U形管消耗药品用量多,为了解决这三个问题,笔者经过大量摸索,对本实验进行了改进。改进后的实验利用废旧的泡沫板自制双孔穴代替U形管,同时利用试纸本身具有的毛细现象及氯水特有的漂白性,以pH试纸和红布条为载体设计了检验电解饱和食盐水产物的微型实验。改进后的装置简单,操作方便,实验现象明显,适合学生分组实验和家庭实验。二、实验仪器及试剂自制双孔穴泡沫板、两根铅笔芯、拆改后的手机充电器、广泛pH试纸、红布条、饱和食盐水。
First, the purpose of the experiment Luke version of chemistry textbook elective 4 Chapter I Section II activities and exploration require students to use the U-shaped tube electrolysis saturated brine and test electrolysis products. In this experiment, the size of the iron platform, students carrying power inconvenience, U-shaped tube consumes more drug consumption, in order to solve these three problems, the author after extensive exploration, the experiment was improved. The improved experiment made use of waste foam board made of double holes instead of U-shaped tube, at the same time, taking advantage of the capillary phenomenon of the test paper itself and the unique bleaching property of chlorinated water, the pH test paper and red cloth strip were used as carriers to test the electrolytic saturated salt water product Micro-experiment The improved device is simple, easy to operate, the experimental phenomenon is obvious, suitable for student group experiments and family experiments. Second, the experimental apparatus and reagents Self-made double-hole foam board, two pencil lead, after the demolition of mobile phone charger, a wide range of pH test strips, red cloth, saturated salt water.