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盐与盐反应生成什么?初中化学课中教师一般总是这么归纳:“盐与盐反应生成两种新盐,反应物必须都是可溶的,而生成物至少应当有一种是沉淀。”这样表述对于部分盐类的复分解反应是正确的,对于初学化学的学生,这样归纳无疑容易接受,也是必要的。但是任何认识或结论都只有相对的真理性,上述规律并不能包罗万象地概括所有的盐与盐之间的反应,我们不能将它强调到不适当的程度,本文就打算在这方面作一些初步探讨。
What does the reaction between salt and salt produce? In the chemistry class for junior high school teachers always generalize this way: “Salt and salt react to produce two new salts. The reactants must all be soluble, and at least one of the products should be precipitate.” The statement that the metathesis reaction of some salts is correct. For beginner chemistry students, such induction is undoubtedly easily accepted and necessary. But any understanding or conclusion is only relative truth. The above laws do not comprehensively summarize all the reactions between salt and salt. We cannot emphasize it to an inappropriate degree. This paper intends to make some preliminary discussions in this regard. .