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柏文同志:您给《湖南教育》编辑室的信谈到,有的资料把无色的 Ag~+与 CO_3~(2-)结合生成的 Ag_2CO_3,说成是白色沉淀,而您在实验过程中看到的 Ag_2CO_3与 AgCl 却略带黄色,又在《简明化学手册》中查得 Ag_2CO_3为黄色粉末,不知孰是孰非。《湖南教育》把您的信转给了我,并嘱我作答。现就我所知,交答卷如下,供参考。我认为您在实验中对 Ag_2CO_3颜色的观察同《简明化学手册》关于碳酸银颜色的记载是一致的,是对的。碳酸银是黄色粉末。至于有的资料把 Ag_2CO_3说成是白色沉淀,可能是单从 Ag~+和 CO_3~(2-)均为无色离子考虑所致,也可能是只注意到实验初时出现的近乎白色的深浊液,而忽略了沉淀的颜色。
Comrade Bowen: Your letter to the “Hunan Education” editorial office mentioned that some of the information described the combination of colorless Ag~+ and CO_3~(2-) with Ag_2CO_3 as a white precipitate and that you were in the process of experimentation. The Ag_2CO_3 and AgCl seen in the study were slightly yellow, and it was found in the “Cheap Chemical Handbook” that Ag_2CO_3 was a yellow powder. “Hunan Education” transferred your letter to me and asked me to answer. As far as I know, the answer is as follows. I think that your observation of the color of Ag_2CO_3 in the experiment is consistent with the description of the color of the silver carbonate in the Handbook of Chemistry, and it is correct. Silver carbonate is a yellow powder. As for some materials, Ag_2CO_3 is said to be a white precipitate, which may be due solely to the fact that Ag~+ and CO~3~(2-) are colorless ions, or it may be noticed only at the beginning of the experiment when the near-white dark cloud appears. Liquid, while neglecting the color of the precipitate.