Dielectric Dispersion of Boric Acid in Water. The Rate of Recombination of H+ and H2BO3— at 35°C

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Abstract
A novel method has been developed for the measurement of the rates of fast ionic reactions in solution. The application of an alternating electrical field to a solution containing a system in mobile equilibrium, such as HA⇌H++A—, causes a small shift in this equilibrium. The shift, to produce more ions, lags behind the changing field and causes an absorption of energy from the field. Measurement of the dielectric constant and loss factor of the solution allows the determination of the relaxation time due to the shift in equilibrium. This is related to conventional rate constants. The method has been applied to the reaction H++H2BO3— in water at 35°C. The rate constant has been determined to be 1.3×1010 M—1 sec—1 at this temperature.