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Applying Le Châtelier’s Principle To Model Strong Acid–Strong Base Titration
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2018-03-01 00:00:00 , DOI: 10.1021/acs.jchemed.7b00575 Philippe H. Mercier 1
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2018-03-01 00:00:00 , DOI: 10.1021/acs.jchemed.7b00575 Philippe H. Mercier 1
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Le Châtelier’s principle is used as a basis to derive an expression to calculate solution pH during titrations that involve only strong acids and strong bases. Central to this model are the reaction quotient and a re-equilibration term that represents the extent of neutralization during a titration. Unlike the method traditionally taught to students to determine the pH of these acid–base mixtures, the expression obtained is exact and applies throughout the entire range of a titration curve without the need for modification or segmentation. The expression is the same as one that is obtainable using charge balance; however, the present derivation applies Le Châtelier’s principle instead, and therefore remains within the scope of a general chemistry curriculum. Instructors are then able to reinforce and deepen understanding of previously learned concepts in acid–base chemistry while connecting them to chemical equilibrium and titration curves.
中文翻译：
应用勒沙泰利耶原理模拟强酸-强碱滴定
LeChâtelier的原理用作推导仅在强酸和强碱滴定过程中溶液pH值的表达式的基础。该模型的核心是反应商和重新平衡项，代表滴定过程中的中和程度。与传统上教给学生确定这些酸碱混合物的pH值的方法不同，所获得的表达式是精确的，并且适用于滴定曲线的整个范围，而无需进行修改或分段。该表达式与使用电量余额可获得的表达式相同；但是，本推导采用了勒沙特里耶原理，因此仍属于一般化学课程的范围。
更新日期：2018-03-01
中文翻译：
应用勒沙泰利耶原理模拟强酸-强碱滴定
LeChâtelier的原理用作推导仅在强酸和强碱滴定过程中溶液pH值的表达式的基础。该模型的核心是反应商和重新平衡项，代表滴定过程中的中和程度。与传统上教给学生确定这些酸碱混合物的pH值的方法不同，所获得的表达式是精确的，并且适用于滴定曲线的整个范围，而无需进行修改或分段。该表达式与使用电量余额可获得的表达式相同；但是，本推导采用了勒沙特里耶原理，因此仍属于一般化学课程的范围。
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