“氧炔焰”的课堂演示西北师范大学化学系张文礼一、实验装置二、实验步骤１．为了保证实验安全并节省课堂时间，课前应向盛有电石的乙炔发生器内加入少量饱和食盐水，用反应产生的乙炔气体将发生器里的空气排尽，勿使空气再次进入发生器。２．演示时，先给乙炔发生器里注... “Oxygen Flame” Class Demonstration Zhang Wenli, Department of Chemistry, Northwest Normal University I. Experimental setup II. Experimental procedure 1. In order to ensure the safety of the experiment and save the classroom time, a small amount of saturated saline solution should be added to the acetylene generator containing calcium carbide before the lesson. The air generated in the generator should be drained by the acetylene gas generated by the reaction, and air should not be allowed to enter the generator again. 2. In the demonstration, give the acetylene generator first...