Approximation of potentiometric titration curves by logarithmic functions: Titration of a mixture of two monobasic acids

The approximation of titration curves by logarithmic functions was described for the titration of a mixture of two monobasic acids. It was demonstrated with the titration of a mixture of CHCl2COOH, CH2ClCOOH, C6H5COOH, and H3BO3 that this method can be used for the precise determination of equivalence points. The relative error in the determination of titration end-points depends on the values of the corresponding jumps and, to some extent, on the choice of a weight function and lies in the range from 0.1 to 1%.