论文部分内容阅读
一、问题的提出全日制普通高级中学教科书实验[6-5]中,浓H_2SO_4与 Cu 反应的实验现象表述为:浓 H_2SO_4与 Cu在加热时能发生反应,放出能使紫色石蕊试液变红或使品红溶液退色的气体,反应后生成物的水溶液显蓝色。化学反应方程式为:2H_2SO_4(浓)+CuCuSO_4+2H_2O+SO_2↑笔者做该实验时,出现了异常现象,反应后的试管内有大量黑灰色沉淀,加水后溶液呈现蓝色,是什么原因造成现象不同呢?为此,我们进行了以下验证实验。
First, the question raised Full-time ordinary high school textbook experiment [6-5], the experimental phenomenon of concentrated H_2SO_4 and Cu reaction expressed as: concentrated H_2SO_4 and Cu can react when heated, release of purple litmus solution Red or faded magenta gas, the reaction of the resultant aqueous solution was blue. The chemical reaction equation is: 2H_2SO_4 (concentrated) + CuCuSO_4 + 2H_2O + SO_2 ↑ I do this experiment, there was an anomaly, the reaction tube after a large number of dark gray precipitation, the solution appears blue after adding water, what causes the phenomenon Different? For this reason, we conducted the following verification experiment.