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Citation: Qing Liu, Jianyu Liu, Haishui Wang. Shift of the Dominant Proton Transfer Reaction from Autoprotolysis of HCO₃^- to Hydrolysis of HCO₃^- Caused by Concentration Change of the NaHCO₃ Solution[J]. University Chemistry, ;2024, 39(1): 305-308. doi: 10.3866/PKU.DXHX202305080 shu

Shift of the Dominant Proton Transfer Reaction from Autoprotolysis of HCO₃^- to Hydrolysis of HCO₃^- Caused by Concentration Change of the NaHCO₃ Solution

Qing Liu ¹ ,
Jianyu Liu ^2,, ,
Haishui Wang ^2,,

1.
Analytical and Testing Center, South China University of Technology, Guangzhou 510640, China;
2.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Corresponding author: Jianyu Liu, Haishui Wang,
Received Date: 29 May 2023

There are several proton transfer reactions and multiple chemical equilibria in NaHCO₃ aqueous solution. As the concentration of the solution changes, the contents of H₂CO₃, H⁺, OH^- and CO₃^2-, which are related to proton transfer reactions, also change. The diagram of [H₂CO₃], [H⁺], [OH^-] and [CO₃^2-] with solution concentration c is plotted. From the diagram, we can directly observe which species are the major and which are the minor. In a high concentration, [H₂CO₃] ≈ [CO₃^2-] >> [OH^-] >> [H⁺], indicating that the proton reactions which can produce H⁺ or OH^- are negligible, and HCO₃^- + HCO₃^- ⇌ H₂CO₃ + CO₃^2- is the dominant. In 9.1×10^-6 mol·L^-1 solution, [OH^-] ≈ [H₂CO₃] >> [H⁺] ≈ [CO₃^2-], indicating that H₂O + HCO₃^- ⇌ H₂CO₃ + OH^- is the dominant. In an extremely dilute solution, [OH^-] ≈ [H⁺] >> [H₂CO₃] > [CO₃^2-], indicating that H₂O ⇌ H⁺ + OH^- dominates.
- NaHCO₃ solution,
- Multiple chemical equilibria,
- Dominant reaction,
- Diagram for the contents of the reaction products
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Shift of the Dominant Proton Transfer Reaction from Autoprotolysis of HCO3- to Hydrolysis of HCO3- Caused by Concentration Change of the NaHCO3 Solution

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通讯作者: 陈斌, bchen63@163.com

Shift of the Dominant Proton Transfer Reaction from Autoprotolysis of HCO₃^- to Hydrolysis of HCO₃^- Caused by Concentration Change of the NaHCO₃ Solution