Exploration of the Optimal Conditions for Producing Chlorine Gas by Reacting Potassium Persulfate with Hydrochloric Acid in the Laboratory
In response to the shortcomings of the current laboratory experiment using MnO2 to react with concentrated HCl to produce chlorine gas,such as the lack of explanation of reactant dosage,difficulty for students to understand the reaction principle,and unclear phenomena,a la-boratory experiment using K2S2O8 to react with HCl to produce chlorine gas was proposed.The orthogonal experimental method was used to ex-plore the optimal process conditions for the reaction of K2S2O8 with HCl to produce chlorine gas in the laboratory.The experiment shows that u-sing K2S2O8 and HCl to produce chlorine gas avoids the defects in the experiment of co heating MnO2 with concentrated HCl to produce chlorine gas.At the same time,the phenomenon is obvious during the experiment,and the reaction rate is moderate,fully meeting the requirements of classroom demonstrations and student experiments.Therefore,it is recommended to use this method in middle school chemistry teaching as a classroom demonstration experiment or a student experiment for preparing chlorine gas.
chlorine gas preparationpotassium persulfate and hydrochloric acidoptimum conditionsorthogonal experiment
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