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Research Article| September 01 1942

Solvent Effects on the Kinetics of Ionic Reactions and the Choice of the Concentration Scale

Hubert G. Davis;

Hubert G. Davis

Department of Chemistry, Columbia University, New York, New York

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Victor K. LaMer

Victor K. LaMer

Department of Chemistry, Columbia University, New York, New York

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Author & Article Information

Hubert G. Davis

Department of Chemistry, Columbia University, New York, New York

Victor K. LaMer

Department of Chemistry, Columbia University, New York, New York

J. Chem. Phys. 10, 585–597 (1942)

https://doi.org/10.1063/1.1723769

The mole fraction scale gives simpler (i.e., more nearly linear) relations between the variables determining kinetics on changing solvents for the bromacetate‐thiosulphate reaction than does the usual volume molar scale. The generality and basis of this finding is discussed from the viewpoint of Rabinowitch's cage model theory as well as from that of equilibrium theory. The quenching of fluorescence, which involves diffusion as a rate determining step, is a more nearly linear function of the fluidity when the data are expressed in mole fraction than in the volume molar scale. Experiments are in progress to determine, if possible, whether the cage model or a modified Smoluchowski diffusion treatment fits the facts better for low activation energy reactions like the quenching of fluorescence in solution.

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© 1942 American Institute of Physics.

1942

American Institute of Physics

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