On the Determination of Reaction Volumes for Coupled Equilibria
The volume change of a chemical reaction is usually determined by measurements of the equilibrium constant at different pressures. This can be a tedious process for coupled equilibria, requiring a large amount of data over a wide pressure range. In this communication we suggest a procedure for determining reaction volumes which has certain advantages over the Standard approach. The method consists of determining the equilibrium constants of a system at a Single pressure, usually atmospheric pressure, and then measuring the signal change (light absorbance conductivity, etc.) as a function of reactant concentrations for a small perturbation from the initial pressure. This small perturbation condition allows use of linear equations which can be derived by simple inspection of the reaction scheme and solved with linear regression analysis. This method can be used for the quantitative analysis of overall amplitudes observed in pressure-jump relaxation experiments.
KeywordsVolume Change Equilibrium Constant Reaction Volume Inverse Matrix Absorbance Change
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