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一、CoGl_2溶液和碱作用最初有蓝色沉淀生成逐渐转变为粉色,最后变为棕色。有人说:“蓝色的是碱式盐,粉色的是Co(OH)_2,棕色的是Co(OH)_3”对吗? 当我们在1 mol·L~(-1)CoCl_2溶液中逐滴加入6 mol·L~(-1) NaOH生成Co(OH)_2固体有两种形式,一种是蓝色的,一种是粉色的。粉色的Co(OH)_2是稳定的,蓝色的Co(OH)_2是不稳定的,将蓝色Co(OH)_2悬浮体加热或放置一段时间便能变为粉色Co(OH)_2,所以这两种Co(OH)_2只是由于制备条件不同而造成的,其实它们都是Co(OH)_2,有的书上认为蓝色的是碱式盐这是不确切的。
First, the solution of CoGl_2 and alkali first formed a blue precipitate gradually transformed into pink, and finally turned brown. Someone said: “Blue is a basic salt, pink is Co (OH) _2, brown is Co (OH) _3” right? When we in 1 mol·L -1 CoCl_2 solution drops Adding 6 mol·L -1 NaOH produces Co (OH) _2 solid in two forms, one is blue and one is pink. The pink Co (OH) _2 is stable and the blue Co (OH) _2 is unstable. The blue Co (OH) _2 suspension can be changed to pink Co (OH) Therefore, these two Co (OH) _2 are only due to different preparation conditions caused by the fact that they are Co (OH) _2, and some books that blue is a basic salt which is not exact.