氨的实验室制法及《氨、铵盐》教法改进

传统的氨气实验室制法产率仅为 44～ 6 0 %,常导致氨的性质演示实验费时且不易成功 .直接在加热试管低温段 ,加入适量碱石灰吸收反应产生的水 ,可使产率达 95 %以上 ,制氨速度大大提高 ,而且不必额外增加干燥装置 .由于制氨方法的改进节约了大量课时 ,故有必要重新调整《氨、铵盐》的教学内容 ,以加强学生观察、发现、分析、推理能力的培养

Ammonia Laboratory Producing Methods and Improvement of Teaching Methods Of Ammonia and Ammonium

The production rate of traditional ammonia producing method is 44～60%, the ammonia demonstration experiments wasting time and unsuccessful. At the time of heating the test tube and low temperature, add some lime to absorb water generated in this change. This method raises the production rate to 95%. The ammonia producing process quickened without extra dehumidification equipments. On the basis of this improvement, class hours are economized. So it is necessary to rearrange the class teaching content of Ammonia and Ammonium in order to cultivate more effectively students' ability of observing, finding, analyzing and reasoning.