Citation: Xuanfeng Yue, Dan Qin, Kexin Zhang, Yanghe Liu, Liangyu Wang, Ting Zhang, Yanni Zhang. New Theory for Principle of Redox Titration[J]. University Chemistry, ;2023, 38(8): 283-292. doi: 10.3866/PKU.DXHX202208117 shu

New Theory for Principle of Redox Titration

Xuanfeng Yue ^1,, ,
Dan Qin ¹ ,
Kexin Zhang ¹ ,
Yanghe Liu ¹ ,
Liangyu Wang ¹ ,
Ting Zhang ¹ ,
Yanni Zhang ^2,,

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

Corresponding author: Xuanfeng Yue, Yanni Zhang,
Received Date: 26 August 2022

To transform the scale of redox titration for a unified formula of the titration scale, a relative concentration of the aqueous electron R_e^- is proposed, and a new theory for redox titration is then developed with pR_e^- as its monitoring scale. This new theory addresses the balancing of the semi-redox-reaction, provides the general formula for calculating pR_e^-, investigates the general variation of pR_e^- in titration, and reintroduces the principle of an electron indicator. In this study, the titration of Ce⁴⁺ to Fe³⁺ solution is used as an example to deduce the following aspects:the approach for drawing titration curves, calculation for titration jump ranges, and criterion of direct and accurate titrations. Finally, the effect of K_r^θ', which is the conditional equilibrium constant of a redox reaction, on titrimetric analysis is discussed.
- Redox titration,
- Relative concentration of aqueous electron,
- Titration curve,
- Electron indicator,
- Accurate titration
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