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Kinetics of two redox reactions in 2‐butoxyethanol and water near its critical point of solution
Author(s) -
Du Zhongyu,
Duan Siyu,
Ma Mingfang,
Xu Xiangyu,
Li Zhenquan,
Kong Lingdong,
Liu Jun
Publication year - 2019
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.21248
Subject(s) - chemistry , critical point (mathematics) , redox , arrhenius equation , reaction rate constant , thermodynamics , critical exponent , reaction rate , kinetics , chemical reaction , rate equation , chemical kinetics , inorganic chemistry , organic chemistry , catalysis , activation energy , phase transition , mathematical analysis , physics , mathematics , quantum mechanics
The rate constants of two redox reactionsFe ( CN ) 6 4 − + S 2 O 8 2 −andFe ( phen ) 3 2 + + S 2 O8 2 −in the critical solution of 2‐butoxyethanol and water have been measured by using the UV spectrophotometry at the initial reaction stage. It was found that the rate constants at various temperatures for two reactions were well described by the Arrhenius equation in the noncritical region. The critical slowing down effect was detected in the critical region. The critical slowing down exponents were determined to be 0.044 ± 0.004 and 0.046 ± 0.005 for reactionsFe ( CN ) 6 4 − + S 2 O 8 2 −andFe ( phen ) 3 2 + + S 2 O8 2 −, respectively. The values of the critical slowing down exponents showed that only dynamic critical slowing down effect, and no thermodynamic singularity could be observed for the two reactions.