Citation:
Lin Yanan, Zhang Chongrong, Dong Wenhao, Zhang Shuyong. Kinetics and Mechanism of Solution Reaction-2: Influential Factors and General Form of Kinetic Equation[J]. Chemistry,
;2016, 79(12): 1204-1208.
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The influential factors for the rate of reactions occurring in solution which is different from those occurring in gaseous phase are discussed. The perception that the presence of solvent molecules will cause a significant decrease in the collision frequency between reactant molecules is proved incorrect. Except for the changes in activity of reactants and the catalysis due to the presence of solvent, solvent effect and micro-viscosity are found to be the two main factors affecting the rate of the solution reactions. The micro-viscosity is either of positive value due to the interaction between reactants and solvent molecules or of negative value due to the small molar mass of solvent which moves with higher speed. Based on the simple collision theory and transition state theory, a general kinetic equation correlating the change in reaction rate to the change in activation energy and micro-viscosity is proposed. Base on this equation, more satisfactory explanations to the experimental facts can be given.
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Keywords:
- Solution reaction,
- Solvent effect,
- Micro-viscosity,
- Activation energy
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