Abstract According to the litmus solution containing carbon dioxide failed to restore purple by heating, this paper revealed the nature that hydrogen chloride and water could form azeotropic solution, and obtained that the impurity of hydrogen chloride could not be removed by boiling the solution.
CHEN Zhao-Xian, GAO Jun. Analysis of Chemical Azeotrope in Junior High School: Litmus Solution Containing Carbon Dioxide Failed to Restore Purple by Heating[J]. Chinese Journal of Chemical Education, 2019, 40(11): 79-81.
