Home

Citation: Wang Fengyun, Chen Minsheng. A STUDY OF IONIZATION CONSTANTS OF ACETIC ACID IN MeOH-WATER AND 1,4-DIOXANEWATER MIXTURES ACCORDING TO SPT[J]. Acta Physico-Chimica Sinica, ;1989, 5(06): 739-744. doi: 10.3866/PKU.WHXB19890620 shu

A STUDY OF IONIZATION CONSTANTS OF ACETIC ACID IN MeOH-WATER AND 1,4-DIOXANEWATER MIXTURES ACCORDING TO SPT

1.
East China Institute of Technology

Received Date: 28 March 1988
Available Online: 15 December 1989

According to the theromodynamical formula of chemical equilibrium, for the reaction:
HAv+H_2O<=>Ac~-+H_3O~+
we have: △G~0=-RT·In(Kα)
or: △g~0=-k_bT·In(K_α)
where, △g~0=g_(Ac)~0-+g_(H3O)~0+-g_(HAc)~0-g_(H2O)~0, g_j~0 is chemical potential or partial molecule Gibbs free-energy of solute j. According to the Scaled Particle Theory (SPT), the Gibbs free-energy of solute j in a solvent is consists of two parts,the first is called the cavitation free-energy (9_j~h), which is the energy needed to transfer a particle from the vacuum to the solvent, and, the second, the interation free-energy (g_j~(OR)), the dispersion energy (g_j~(DS)) and the static energy (g_j~(EL)), So:
g_i~0=g_j~h+g_j~(IN)+g_j~(OR)+g_j~(DS)+g_j~(EL)
then we have: K_a/k_a~0=exp(-Δg~0/k_bT)
where K_a is the ionization constant of HAc in the vacuum, and, is unknown. To solve the problem, we have to select another standard solvent in which, the K_a′ of HAc is well known of course, water is the best one, in it, the K_a′ of HAc is 1.754×10~(-5) at 298 K, and finally we have
K_a=K_a′exp(-Δ(Δg~0/k_bT)
where: Δ(Δg~0)=Δg~0 (in the solvent studying)-Δg~0′ (in water)
According to the theory and formula developed above, we took a series of MeOH-Water mixtures and 1,4-Dioxane-Water mixtures as example in this article, and calculated the K_a of HAc in those mixtures. By comparing the values with that from literatures we found that they are accordance well when the weight per-cent of the non-water conponents is less than 90% and not as larger than 90%. The reasons causing the results are discussed mainly at the end.
1. [1]
  Heng Zhang . Determination of All Rate Constants in the Enzyme Catalyzed Reactions Based on Michaelis-Menten Mechanism. University Chemistry, 2024, 39(4): 395-400. doi: 10.3866/PKU.DXHX202310047
2. [2]
  Hua Hou , Baoshan Wang . Course Ideology and Politics Education in Theoretical and Computational Chemistry. University Chemistry, 2024, 39(2): 307-313. doi: 10.3866/PKU.DXHX202309045
3. [3]
  Qiuyang LUO , Xiaoning TANG , Shu XIA , Junnan LIU , Xingfu YANG , Jie LEI . Application of a densely hydrophobic copper metal layer in-situ prepared with organic solvents for protecting zinc anodes. Chinese Journal of Inorganic Chemistry, 2024, 40(7): 1243-1253. doi: 10.11862/CJIC.20240110
4. [4]
  Ji-Quan Liu , Huilin Guo , Ying Yang , Xiaohui Guo . Calculation and Discussion of Electrode Potentials in Redox Reactions of Water. University Chemistry, 2024, 39(8): 351-358. doi: 10.3866/PKU.DXHX202401031
5. [5]
  Hongyi Zhang , Zhihong Shi , Zhijun Zhang . A New Strategy for “De-formulized” Calculation of Dynamic Buffer Capacity in Analytical Chemistry Education. University Chemistry, 2024, 39(3): 390-394. doi: 10.3866/PKU.DXHX202309030
6. [6]
  Shuying Zhu , Shuting Wu , Ou Zheng . Improvement and Expansion of the Experiment for Determining the Rate Constant of the Saponification Reaction of Ethyl Acetate. University Chemistry, 2024, 39(4): 107-113. doi: 10.3866/PKU.DXHX202310117
7. [7]
  Zhiguang Xu , Xuan Xu , Qiong Luo , Ganquan Wang , Bin Peng . Reform and Practice of Online and Offline Blended Teaching in Structural Chemistry Course. University Chemistry, 2024, 39(6): 195-200. doi: 10.3866/PKU.DXHX202310112
8. [8]
  Qian Huang , Zhaowei Li , Jianing Zhao , Ao Yu . Quantum Chemical Calculations Reveal the Details Below the Experimental Phenomenon. University Chemistry, 2024, 39(3): 395-400. doi: 10.3866/PKU.DXHX202309018
9. [9]
  Ling Fan , Meili Pang , Yeyun Zhang , Yanmei Wang , Zhenfeng Shang . Quantum Chemistry Calculation Research on the Diels-Alder Reaction of Anthracene and Maleic Anhydride: Introduction to a Computational Chemistry Experiment. University Chemistry, 2024, 39(4): 133-139. doi: 10.3866/PKU.DXHX202309024
10. [10]
  Tingbo Wang , Yao Luo , Bingyan Hu , Ruiyuan Liu , Jing Miao , Huizhe Lu . Quantitative Computational Study on the Claisen Rearrangement Reaction of Allyl Phenyl Ethers: An Introduction to a Computational Chemistry Experiment. University Chemistry, 2024, 39(11): 278-285. doi: 10.12461/PKU.DXHX202403082
11. [11]
  Shengyan Yang , Xiangzhen Meng , Xin Wang , Yang Zhang . Construction and Exploration of an Online-Offline Blended “Eight-Link” Teaching Method for Physical Chemistry Experiments Based on OBE Concept. University Chemistry, 2024, 39(11): 28-37. doi: 10.3866/PKU.DXHX202402019
12. [12]
  Zhenming Xu , Mingbo Zheng , Zhenhui Liu , Duo Chen , Qingsheng Liu . Experimental Design of Project-Driven Teaching in Computational Materials Science: First-Principles Calculations of the LiFePO₄ Cathode Material for Lithium-Ion Batteries. University Chemistry, 2024, 39(4): 140-148. doi: 10.3866/PKU.DXHX202307022
13. [13]
  Fangdong Hu , Xiaolei Jiang . Research and Practice of the “Integration of Theory and Practice Drives Innovation” Teaching Mode in Inorganic Chemistry under the Background of “Four New” Construction. University Chemistry, 2024, 39(11): 1-8. doi: 10.3866/PKU.DXHX202402013
14. [14]
  Cunling Ye , Xitong Zhao , Hongfang Wang , Zhike Wang . A Formula for the Calculation of Complex Concentrations Arising from Side Reactions and Its Applications. University Chemistry, 2024, 39(4): 382-386. doi: 10.3866/PKU.DXHX202310043
15. [15]
  Tiejun Su . The Construction and Application of the Calculation Formula for Endpoint Error in Precipitation Titration: A Case Study of the Mohr Method. University Chemistry, 2024, 39(11): 384-387. doi: 10.12461/PKU.DXHX202402039
16. [16]
  Jin CHANG . Supercapacitor performance and first-principles calculation study of Co-doping Ni(OH)₂. Chinese Journal of Inorganic Chemistry, 2024, 40(9): 1697-1707. doi: 10.11862/CJIC.20240108
17. [17]
  Fei Xie , Chengcheng Yuan , Haiyan Tan , Alireza Z. Moshfegh , Bicheng Zhu , Jiaguo Yu . d带中心调控过渡金属单原子负载COF吸附O₂的理论计算研究. Acta Physico-Chimica Sinica, 2024, 40(11): 2407013-. doi: 10.3866/PKU.WHXB202407013
18. [18]
  Jie ZHAO , Sen LIU , Qikang YIN , Xiaoqing LU , Zhaojie WANG . Theoretical calculation of selective adsorption and separation of CO₂ by alkali metal modified naphthalene/naphthalenediyne. Chinese Journal of Inorganic Chemistry, 2024, 40(3): 515-522. doi: 10.11862/CJIC.20230385
19. [19]
  Ronghao Zhao , Yifan Liang , Mengyao Shi , Rongxiu Zhu , Dongju Zhang . Investigation into the Mechanism and Migratory Aptitude of Typical Pinacol Rearrangement Reactions: A Research-Oriented Computational Chemistry Experiment. University Chemistry, 2024, 39(4): 305-313. doi: 10.3866/PKU.DXHX202309101
20. [20]
  Xuanzhu Huo , Yixi Liu , Qiyu Wu , Zhiqiang Dong , Chanzi Ruan , Yanping Ren . Integrated Experiment of “Electrolytic Preparation of Cu₂O and Gasometric Determination of Avogadro’s Constant: Implementation, Results, and Discussion: A Micro-Experiment Recommended for Freshmen in Higher Education at Various Levels Across the Nation. University Chemistry, 2024, 39(3): 302-307. doi: 10.3866/PKU.DXHX202308095

Get Citation

PDF

XML

Metrics

PDF Downloads(1822)
Abstract views(2303)
HTML views(6)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Address：Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888

DownLoad: Full-Size Img PowerPoint

Return