【摘要】 本文根据模糊集合理论,通过实验邮据和计算机推宋出确定红、橙、黄颜色模糊概念的隶属函数μ(x)。提出指示剂变色转折点和变色转折区间的两个新概念,从而提出中和滴定法中选择指示剂的新规则:指示剂的变色转折区间至少应有一个全部落在滴定突跃范围内。应该强调指出新规则是根据指示荆的变色转折区间而不是传统的指示剂变色区间。甲基橙变色转折区间为pH3.01～3.24及4.38～4.59,甲基红的为4.29～4.70及6.12～6.45。更多还原

【Abstract】 The membership functions μ(x) of fuzzy concept of red, orange and yellow are derived on the basis of the experiment data with fuzzy set theory on a microcomputer. Two new concepts of the turning point and the turning interval of indicator color change are suggested, therefore a new rule of choosing indicator in neutratitration method is advanced: At least one of the turning intervals of the indicator color change should be entirely covered with the titration abruption interval It is emphasized that the new rule is based on the turning interval of the indicator color change instead of the interval of indicator color change in tradition. The turning intervals of methyl orange color change are pH 3.01-3.24 and 4.38-4.59, as well as pH 4.29- 4.70 and 6.12- 6.45 for methyl red.更多还原