Unifying Titration Curve Equation for Integration of Titrimetric Methods in Chemical Analysis
YUE Xuan-Feng1, XIE Zun-Yuan1, WANG Shan-Shan1, WANG Zi-Zhen1, HONG Xin1, ZHANG Yan-Ni2**
1. Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering of Shaanxi Normal University, Xi’an 710062, China; 2. Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, School of Life Science of Shaanxi Normal University, Xi’an 710062, China
Abstract In order to unify the equations for the four titration curves and further integrate titration theory, according to the number of chemical equilibriums involved in the titration, the titrations are classified into two categories in this paper. By taking the 1∶1 titration system as an example, with the monitoring scale of the titration set as the unified p form (i.e. pH, pM, pRe- or pX), two corresponding general formula for titration curve equations are derived and applied to eight specific titration systems. The application results show that the general formula not only well reflect the essence of the existing theory, but also allow easy extrapolations to more titration systems, fully demonstrating the rationality and scientificity of the integration approach proposed.
YUE Xuan-Feng, XIE Zun-Yuan, WANG Shan-Shan, WANG Zi-Zhen, HONG Xin, ZHANG Yan-Ni. Unifying Titration Curve Equation for Integration of Titrimetric Methods in Chemical Analysis[J]. Chinese Journal of Chemical Education, 2023, 44(24): 110-115.
