University Chemistry ›› 2016, Vol. 31 ›› Issue (11): 89-92.doi: 10.3866/PKU.DXHX201603004

• Self Studies • Previous Articles     Next Articles

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)

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