Abstract: The chemical experiment “Preparation of Ammonium Ferrous Sulfate” generates waste gases, which pose environmental pollution and health risks. This paper explores the greening of this experiment’s teaching by optimizing the reaction system. The open apparatus is transformed into a closed system, allowing for the absorption of exhaust gases, thereby achieving zero emissions and fulfilling green chemistry requirements. The implementation of green teaching in this experiment is significant for stimulating students’ exploratory spirit, enhancing their practical skills, increasing their environmental awareness, and fostering teamwork.

Key words: Ammonium ferrous sulfate, Green chemistry, Comparative method, Inorganic chemistry experiment, Course ideological and political education