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离子浓度大小的比较是个重要的知识点,也是高考热点。对于这个知识点的许多概念,以及比较离子浓度大小的方法和技巧,不少同学尚掌握不够好,很有必要从实质上总结归纳。 一、强酸弱碱盐和强碱弱酸盐的离子浓度大小的比较。 盐溶液中弱碱阳离子或弱酸根离子和水电离生成的OH~-或H~+结合成难电离的弱碱或弱酸,使溶液中弱碱阳离子或弱酸根离子浓度略
The comparison of ion concentration is an important knowledge point, and it is also a college entrance examination hotspot. For many concepts of this knowledge, as well as methods and techniques for comparing the concentration of ions, many students are still not good enough and it is necessary to sum up them in essence. First, the comparison of the ion concentration of strong acid and weak base salt and strong base weak acid salt. The weak alkali cation or weak acid ion in the salt solution and the OH~- or H~+ ionized by water combine to form a weak alkali or weak acid that is difficult to ionize, so that the concentration of weak alkali cation or weak acid ion in the solution is slightly