Abstract Starting from the titration curve, the titration of strong-weak mixed acid system (HCl-HA) was analyzed when the end point was determined by acid-base indicator. The results show that it is impossible to titrate the HCl and HA stepwise and accurately, when Er=±0.1% and the initial concentration of each monoacid is 0.10 mol·L-1. But if Er=±0.5%, the weak acid(HA) and the strong acid(HCl) can be titrated separately and accurately, the requirement is as follows: 10-7.57≤Ka,HA≤10-6.50. The method is simple and practical. It has good results in teaching.
LIU Dian-Mei, XIONG Dao-Ling, LUO Xu-Yan. Analysis of Strong-Weak Mixed Acid Titration from Titration Curve[J]. Chinese Journal of Chemical Education, 2020, 41(22): 95-97.
