Abstract The sensor digitization technology is used to analyze the behavior of sodium bicarbonate dilute solution about absorbing or releasing carbon dioxide gas at room temperature. Meanwhile, pH value and its change trend are obtained. The digitization experiment is designed to provide chemical experimental verification for sodium bicarbonate solution's behavior as carbon dioxide buffer in biology. The thermodynamic calculation provides the chemical theory support for its buffer principle. Experiments show that sodium bicarbonate dilute solution is able to build carbon dioxide buffer sufficiently and necessarily. What's more, its buffer principle is based on the establishment of HCO-3/CO2-3 buffer pair from accidentally self-ionization of sodium bicarbonate, so as to establish dissolved balance with the carbon dioxide in environment. The total equation is 2HCO-3(aq)CO2-3(aq)+H2O(l)+CO2(g).
ZHU Zhuang-Li, PI Hong-Wei, JIANG Xu-Min, WANG Jing-Wen. Analysis of Buffer Principle of Carbon Dioxide Buffer Solution by Digital Experiment[J]. Chinese Journal of Chemical Education, 2020, 41(15): 63-66.
