高中化学课本中，乙炔气体的制取是用饱和食盐水代替蒸馏水与碳化钙反应，目的是为了降低水的浓度而减缓反应速率。但实验时反应仍然很剧烈，并产生大量泡沫沿容器上升至容器口处，甚至进入导管而影响气体的排出和收集。在多年的教学实践中，通过多次实验发现，在不改变课本中 In high school chemistry textbooks, the preparation of acetylene gas is to use saturated brine instead of distilled water to react with calcium carbide in order to reduce the concentration of water and slow the reaction rate. However, the reaction was still very severe during the experiment, and a large amount of foam was generated rising along the container to the mouth of the container and even entering the catheter to affect the gas discharge and collection. In many years of teaching practice, it has been found through many experiments that it does not change textbooks.