General Procedure for the Easy Calculation of pH in an Introductory Course of General or Analytical Chemistry
General Procedure for the Easy Calculation of pH in an Introductory Course of General or Analytical Chemistry
复制标题
普通化学或分析化学入门课程中轻松计算 pH 值的一般程序
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
L. Salvatella
中科院分区：
文献类型：
--
作者：
G. Cepriá;L. Salvatella
在普通化学或分析化学入门课程中使用的简单酸碱体系的所有pH计算都可以通过使用要求使用优势图的一般程序来进行。具体来说，pH值被计算为等于图解步骤中涉及的酸的平均pKa值的独立项和浓度依赖值的和，该值被计算为ΔPC(即，与优势图解步骤中涉及的主要物种相对应的−对数酸+对数Cbase)与图解步骤中涉及的控制pH的酸碱对的数量(对于共轭或非共轭体系，分别为一个或两个)之间的比率。许多酸碱特征可以通过这个过程很容易地解释。这种方法可以扩展到络合平衡。
All pH calculations for simple acid–base systems used in introductory courses on general or analytical chemistry can be carried out by using a general procedure requiring the use of predominance diagrams. In particular, the pH is calculated as the sum of an independent term equaling the average pKa values of the acids involved in the diagram step and a concentration-dependent value, calculated as the ratio between ΔpC (that is, −log Cacid + log Cbase, corresponding to the predominant species involved in the predominance diagram step) and the number of pH-controlling acid–base pairs involved in the diagram step (one or two for conjugate or nonconjugate systems, respectively). A number of acid–base features can be readily explained via this procedure. This methodology can be extended to complexation equilibria.