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人教社出版的化学（必修）第一册第１７９页［实验６－５］，铜片与稀HNO３反应的演示实验存在一些不足之处，我们作了如下改进。１实验装置实验装置如图１所示。２改进方案a．用滴定管夹固定两只具支试管在滴定台上，分别加入一定量的稀HNO３。b．铜片换成螺旋状铜丝，将铜丝
In the first edition of Chemistry (required) published by People’s Education Society, page 179 [Experiment 6-5], there are some deficiencies in the demonstration experiment of the reaction between copper and dilute HNO3. We have made the following improvements. 1 experimental device Experimental device shown in Figure 1. 2 improvement program a. Use a burette clamp to fix two test tubes on the titration stand and add a certain amount of diluted HNO3. b. Copper plate replaced with spiral copper wire, copper wire