大学化学 >> 2016, Vol. 31 >> Issue (11): 89-92.doi: 10.3866/PKU.DXHX201603004

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多元弱酸(碱)溶液pH的简易通用计算方法

柳青1,王海水2,*()   

  1. 1 华南理工大学分析测试中心, 广州 510640
    2 华南理工大学化学与化工学院, 广州 510640
  • 发布日期:2016-11-30
  • 通讯作者: 王海水 E-mail:wanghsh@scut.edu.cn
  • 基金资助:
    国家自然科学基金(20873136)

A Simple and Universal Method for Finding the pH of a Solution Containing a Weak Polyprotic Acid (or Base)

Qing LIU1,Hai-Shui WANG2,*()   

  1. 1 Analytical and Testing Center, South China University of Technology, Guangzhou 510640, P. R. China
    2 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
  • Published:2016-11-30
  • Contact: Hai-Shui WANG E-mail:wanghsh@scut.edu.cn
  • Supported by:
    国家自然科学基金(20873136)

摘要:

提出了计算多元弱酸(或碱)溶液pH的新方法。该计算方法具有以下特点:限制条件简单,即多项式中某一项小于最大项的5%即可忽略该项贡献;计算过程和步骤清晰易记;通用性好,一元或多元弱酸(碱)溶液pH计算均可适用。

关键词: 多元弱酸, 多元弱碱, pH计算, 新方法

Abstract:

This paper presents a novel method for finding the pH of a solution containing a weak polyprotic acid (or base).The new method has the following characteristics:its constraint condition is simple, namely if a term is less than 5% of the maximum term among the polynomial, its contribution can be ignored.The calculation steps are clear and normalized.The universality of the new method is good, applicable to the pH calculation for both weak polyprotic acids and weak polyprotic bases.

Key words: Weak polyprotic acid, Weak polyprotic base, pH calculation, New method

MSC2000: 

  • G64