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铜与浓硫酸反应实验是中学化学教学中的一个重要演示实验和学生实验,高中教材中该实验的实验装置如图1所示。实验有如下不足:1.硫酸浓度不知,以前教材中有溶液变蓝的实验现象的描述,现行的人教版教材中没有了。用市售浓硫酸做实验,但反应时看不到溶液变蓝。2.未反应完的铜片在回收方式上有缺陷。通常将反应后的剩余物倒入水池中,大水冲洗后用手捡拾铜片过程中存在危险。
Reaction experiment between copper and concentrated sulfuric acid is an important demonstration experiment and student experiment in middle school chemistry teaching. The experiment device of high school teaching material is shown in Fig.1. Experiments have the following deficiencies: 1. Sulfuric acid concentration unknown, the previous textbook solution of the blue phenomenon of the experiment, the current version of the PEP no teaching material. Experiment with commercially available concentrated sulfuric acid, but the reaction can not see the solution turns blue. 2. The unreacted copper is defective in the recovery method. The reaction residue is usually poured into the pool, which is dangerous in the process of picking up the copper sheet by hand after rinsing with water.