Abstract
The pH of any polyprotic weak and strong acid (or base) can be calculated employing the logarithmic concentration diagram. The aim of this text is to introduce a joint approach of algebraic, as used in textbook, and graphical method. The logarithmic diagrams provide an easy insight into the acid–base systems. The mathematical complexities are overtaken using a Computer Algebra System program, which is also exploited to draw the diagrams. Examples of the use of the program are given together with the code employed.
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