论文部分内容阅读
一、问题的提出上海市高中化学实验教材(上科版)中实验二“测定常温下1mol 氢气的体积”是利用一定量的镁跟酸的反应生成氢气的体积,推算1mol 氢气的体积。实验中使用了“测气管”(如下图所示)这种仪器,使实验的可操作性大大提高了,然而,笔者认为这个实验仍有一些不尽如人意的地方。其一,在实验中,向测气管中注入盐酸,要求酸液尽可能不粘在管壁上,然后再注入水,要求尽可能不搅动底部的酸液,实际操作存在相当大的困难。其二,随着
First, the problem raised Shanghai high school chemistry experiment textbook (upper version) in Experiment two “Determination of 1mol hydrogen at room temperature volume” is the use of a certain amount of magnesium and acid reaction to generate hydrogen volume, calculate the volume of 1mol hydrogen. The use of a “gas pipe” (as shown in the figure below) in the experiment has greatly improved the operability of the experiment. However, I think there is still some unsatisfactory place in this experiment. First, in the experiment, hydrochloric acid was injected into the gas measuring tube to require that the acid should not stick to the pipe wall as much as possible, and then water should be injected. As far as possible, the acid at the bottom should be agitated. There are considerable difficulties in actual operation. Second, with