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Citation: YUE Xuanfeng, ZHANG Yue, ZHANG Yanni, QI Honglan, ZHANG Chengxiao. Criterion for Accurate Stepwise Titration of Mixed Acids[J]. University Chemistry, ;2018, 33(8): 52-57. doi: 10.3866/PKU.DXHX201802013 shu

Criterion for Accurate Stepwise Titration of Mixed Acids

1.
Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, Shaanxi Normal University, Xi'an 710062, P. R. China;
2.
Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, Shaanxi Normal University, Xi'an 710062, P. R. China

Received Date: 9 February 2018

A mixture of monobasic strong acid and monobasic weak acid was chosen to derive the universal criterion for evaluating the feasibility of accurate stepwise titration of equimolar mixture with indicators. It is found that with an acceptable maximum relative error of 0.1%, the accurate stepwise titration can't be achieved unless two requirements are satisfied:the concentration of each acid is no less than 0.544 mol·L^-1, and the pK_a of weak acid is in the range of 5.6-8.3. The requirements vary with the acceptable maximum relative error.
- Mixed acid,
- Stepwise titration,
- Direct and accurate,
- Criterion
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