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Citation: LIU Qing, WANG Hai-Shui. A Simple and Universal Method for Finding the pH of a Solution Containing a Weak Polyprotic Acid (or Base)[J]. University Chemistry, ;2016, 31(11): 89-92. doi: 10.3866/PKU.DXHX201603004 shu

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

LIU Qing ^1, ,
WANG Hai-Shui ²

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

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.
- Weak polyprotic acid,
- Weak polyprotic base,
- pH calculation,
- New method
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