Abstract In this study, the catalytic effect of halides on metal replacement reaction was studied qualitatively and quantitatively. The experimental results show that all halogen elements have catalytic effect, and Cl- has the most obvious catalytic effect; compared with alkaline earth metal ions, the copper tree crystal shape is more regular under alkali metal conditions, and the ornamental effect is better; at the same time, the reaction rate is positively correlated with Cl- concentration. Through the exploration of reaction conditions, the so-called “copper tree” reaction of aluminum replacement of copper is transformed into a classroom demonstration experiment which can produce obvious phenomena in 20 minutes. It can create a situation for the teaching of metal replacement reaction and electrochemical corrosion kinetics, and cultivate students' chemical core literacy of evidence reasoning and model cognition.
CHEN Ting, HUANG Ping, WEN Jie-Cheng, RAN Ming. Effects of Halides on Rate of Cu-Al Replacement Reaction[J]. Chinese Journal of Chemical Education, 2021, 42(19): 92-95.