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在多年的教学过程中,笔者发现一种现象:学生在接触盐类的水解平衡之前,对诸如“中和等物质的量浓度等体积的盐酸和醋酸所需的NaOH的物质的量是否相等”、“NH4Cl溶液中,NH4+与H+离子浓度相对大小比较”等问题能非常清晰准确地回答;而在学习了盐类的水解后,对上述问题的回答或显得不够自信或出现思维混乱差错不断。细思此类现象出现的症结,笔者认为与片面夸大盐类的水解程度不无关系。
During many years of teaching, I discovered a phenomenon: students are expected to equalize the amount of NaOH required for an equal volume of hydrochloric acid and acetic acid, such as “neutralizing” “, ” NH4Cl solution, NH4 + and H + ion concentration relative size comparison "and other issues can be very clear and accurate answer; and after learning the salt hydrolysis, the answer to these questions or not confident enough or thinking Chaos mistakes continue. Thinking of the crux of such phenomena, I believe that with the one-sided exaggeration of the degree of salt hydrolysis is not unrelated.