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按照人教社初中化学课本上的要求测定空气中Ｏ2 含量时 ,存在以下问题 :容器较大 ,钟罩水面以上容积 5等分存在一定误差 ;所需红磷较多 ;水位上升位置误差较大。为了简化实验操作 ,减小误差 ,我对该图 1实验作了如下改进 ,改进后实验装置如图1。1 改进后实验优点容器较小 ,所
According to the requirements of textbooks for junior high school students in the junior high school, the following problems exist in the determination of O2 content in the air: the container is large, there is a certain error in the volume of the bell jar above the water surface; more red phosphorus is needed; the error in the water level rise is larger . In order to simplify the experimental operation and reduce the error, I have made the following improvements to the experiment in Figure 1. The improved experimental device is shown in Figure 1. 1 The improved experimental advantage container is smaller.