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铜与浓硫酸在加热条件下反应产生的气体使润湿的蓝色石蕊试纸变红 ,观察反应后溶液的颜色呈蓝色 ,从而证明了浓硫酸具有强氧化性。但是在实际操作中 ,该实验成功率不高 ,根据笔者反复实验和仔细观察 ,认为课本在这两个实验的设计上存在以下几点不足 :(1 )铜片与浓硫酸加热反应
The gas produced by the reaction of copper and concentrated sulfuric acid under heating conditions turned the wet blue litmus paper red, and the color of the solution after the reaction was observed to be blue, thus demonstrating the strong oxidizing power of concentrated sulfuric acid. However, in the actual operation, the success rate of this experiment is not high. According to the author’s repeated experiments and careful observation, it is considered that the textbook has the following deficiencies in the design of these two experiments: (1) Heating reaction of copper sheet with concentrated sulfuric acid