THE DEPENDENCE OF THE HYDROLYSIS OF DIAZOACETIC ESTER ON THE HYDROGEN ION CONCENTRATION

Abstract

The catalytic constants of the H₃O⁺ catalyzed hydrolysis of diazoacetic ester in aqueous solutions containing sodium perchlorate have been determined at three different ionic strengths. A spectrophotometric method was used to follow the rate. The results indicate a strong positive salt effect. Measurements at the ionic strength μ = 0.110 were carried out in the pH region from 1.97 to 5.19. For solutions containing less than 10⁻³ N perchloric acid the pH data were taken from measurements with a. glass electrode in the kinetic cell. Within the limits of experimental error no deviations from proportionality between rate and [H₃O⁺] were found. This result is important in connection with our findings for the benzalaniline hydrolysis since it tests the methods applied and proves that the benzalaniline example with deviations from linearity between rate and [H₃O⁺] is a special case. The diazoacetic ester hydrolysis is not catalyzed by acetic acid molecules.