一、演示实验的改进氯气的实验室制法 ,按教材中的装置 ,制气时虽可以吸收尾气 ,但当需要制取多瓶氯气时 ,在更换集气瓶时就有氯气逸出。如果一个班次一次上课收集四瓶氯气 ,一个教师带四个班 ,就要收集 16瓶氯气 ,逸出的氯气对教师的毒害是可以想象的 ,不少年轻教师很害怕做这 I. Laboratory improvement of chlorine gas demonstration According to the device in the textbook, although the exhaust gas can be absorbed during the gas generation, chlorine gas escapes when replacing the gas collection bottle when a lot of chlorine gas needs to be produced. If a class takes four bottles of chlorine at a time and one teacher takes four classes, it will collect sixteen bottles of chlorine. The poisoning of the escaping chlorine gas is imaginable. Many young teachers are afraid to do this.