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现行中师化学教材中关于氨的催化氧化的演示实验,所述方法不甚周密,难以达到应有的效果。为此,我们作了两次实验装置的改进,具体做法如下: 第一次改进,考虑到原教材实验装置中的导气管未固定,教师上课时一人操作起来不方便。另外,由导气管导入的空气(一般以脚踏皮老虎鼓入)气流大小难以控制,气流太小空气供应不足,太大了铂金丝上的热量很快散失,两种情况都会导致铂金丝不能保持红热,影响实验效果。因此,我们将实验装置简化:去掉导气管,只用一个250mL的锥形瓶,一根铂金丝棒(即做焰色反应实验时所用的铂丝棒,不一定绕教材所示的螺旋状),另加一盏酒精灯。
The demonstration experiment on the catalytic oxidation of ammonia in the current textbook on chemistry of middle school teachers is not very thorough and it is difficult to achieve the desired results. To this end, we made two experimental device improvements, the specific approach is as follows: The first improvement, taking into account the original textbook experimental device in the airway is not fixed, the teacher when the class is inconvenient to operate. In addition, the air introduced by the air duct (usually peddled by a treadmill) is difficult to control, the airflow is too small and the air supply is insufficient, too much heat on the platinum wire quickly dissipates. In both cases, the platinum wire cannot be produced. Keeping red heat affects the experimental results. Therefore, we simplified the experimental setup by removing the airway tube and using only a 250-mL Erlenmeyer flask and a Platinum wire rod (that is, the platinum wire rod used for the flame reaction experiment, not necessarily spiraling around the textbook). Plus an alcohol lamp.