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在大学化学教学中, 多元弱酸溶液氢离子浓度计算条件在不同的教材中有不同的版本, 这给教师和学生的教与学都带来了困惑.由氢离子浓度计算的最简式所要求的相对误差确定了多元弱酸氢离子浓度计算允许的相对误差, 通过讨论可忽略二级酸解离产生的氢离子浓度所需的一级和二级酸常数的比值条件, 选出了具有相对通用性的计算条件和一种更具普遍适用性的计算策略.“,”In the teaching of University Chemistry, there are diverse versions in different textbooks about calculation condition of the hydrogen ions concentration in polybasic weak acid solutions.This brings much confusion to the teaching of teachers and the learning of students.The calculation condition with relative versatility was selected through discussing Ka1/Ka2 of polybasic weak acids to determine whether the hydrogen ions dissociated by the second dissociation of polybasic weak acids could be ignored.The discussion was based on the allowed relative error of the simplist calculating formula of the hydrogen ions concentration of weak acids.The calculation strategy with general applicability based on charge balance equation was also discussed.