Quantitative Experiment of Nitrogen Dioxide Dissolving in Water
LI Da-Tang1, ZHANG Xin1, WANG Jian2, TANG Jian-Ting1
1. College of Chemistry & Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China; 2. The No.2 Middle School of Xiangtan City, Xiangtan 411100, China
Abstract This article designed a quantitative experiment of nitrogen dioxide dissolved in water. The experiment indicated that when the test tube filled fully with NO2 was inverted in water, the liquid volume in the test tube would be much more than two-thirds of the tube volume while the liquid level in the test tube was basiclly stable after a few minutes, and the test tube would be filled fully with liquid if the experiment lasted long enough (14 h). Further study showed main possible reasons leading to these phenomena. First, it was related to the saturated vapor pressure of concentrated nitric acid when NO2 was prepared. Secondly NO can dissolve in water and react with dissolved oxygen. In addition, that NO can dissolve in dilute nitric acid may be one of reasons. However, dimerization of NO2 was irrelevant. That test tube could be filled with liquid may be closely related to the diffusion of oxygen in water.
