Abstract This study innovatively designed a two-liquid primary battery to physically isolate NO-2 and NO2 produced during the reaction between copper and concentrated nitric acid, systematically investigating the regulatory effect of NO-2 on the reaction rate. Experimental results demonstrated that the copper nitrite complex formed by NO-2 and Cu2+ significantly reduced Cu2+ concentration and enhanced the reducibility of copper, thereby accelerating the reaction. Kinetic analysis further elucidated the mechanism behind the abrupt color change of the solution from green to blue during the reaction, confirming the catalytic role of NO-2. This research not only deepens the understanding of the copper-nitric acid reaction mechanism, but also provides a practical inquiry-based case for high school chemistry experimental teaching, highlighting the regulatory function of coordination compound in redox reactions.
ZHU Ma-Er, YANG Li-Gang, LIU Yong-Zhen, ZHANG Xiao, MO Fei, WANG Qi-Ming, SHA Mi-Ya, YANG Yi-Xiao. Experimental Inquiry on Influence of Nitrite Ion on Reaction Rate Between Copper and Concentrated Nitric Acid[J]. Chinese Journal of Chemical Education, 2025, 46(23): 113-116.
