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有关溶液中微粒浓度的大小比较问题是中学化学中常见的问题。这类题目知识容量大、综合性强,涉及的知识点有:弱电解质的电离平衡、盐类的水解、电解质之间的反应等,既是教学的重点,也是高考的重点。如何用简捷的方法准确寻找这类问题的答案呢?在电解质溶液中常存在多个平衡关系,应抓住主要矛盾(起主要作用的平衡关系),利用两种理论、三种守恒、三个观点去分析解题。
The problem of comparing the size of particles in solution is a common problem in secondary chemistry. Such topics knowledge of large capacity, comprehensive, involving the knowledge points are: ionization of weak electrolyte balance, salt hydrolysis, electrolyte reaction between the two is not only the focus of teaching, but also the focus of the entrance. How to find the answer to this kind of problem accurately and simply? There are many balance relations in the electrolyte solution, we should grasp the main contradiction (the main role of the balance), using two theories, three kinds of conservation, three points of view To analyze the problem solving.