Abstract Through the experimental investigation and theoretical analysis, this paper found that the solution was light green after the reaction of copper and ferric chloride and the reason was that the reaction of Cu and CuCl2 generated CuCl white precipitate which consumed the Cu2+ in solution. According to this conclusion, this paper revised the experimental design and point of view in a former literature, and carried out scientific transformation of two test questions about the reaction of Cu and FeCl3.
