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一、空气中氧气含量测定实验1.实验准备实验用品红磷、具支试管、20mL注射器、胶皮导管、酒精灯、试管夹、胶塞。实验装置如图1所示。2.操作步骤按图将仪器连接好,将注射器拉到最大量程20mL,并把红磷装入试管中。将试管放在酒精灯火焰上加热,观察到红磷在试管中剧烈燃烧,产生大量白烟。当加热到反应不再发生时,冷却后可观察到注射器量程由原20mL减小到16mL,减少了1/5。
First, the determination of oxygen in the air experiment 1. Experimental Preparation Experimental supplies of red phosphorus, with a test tube, 20mL syringe, plastic catheter, alcohol lamp, test tube clamp, rubber stopper. The experimental setup is shown in Figure 1. 2 steps according to the figure will be connected to the instrument, the syringe pulled the maximum range of 20mL, and the red phosphorus into the test tube. The test tube on the alcohol lamp flame heating, observed in the test tube violent red phosphorus burning, resulting in a large number of white smoke. When heated to the reaction no longer occurs, the syringe can be observed after cooling reduced range from the original 20mL 16mL, a decrease of 1/5.