Kinetics and mechanism of hydrolysis of di-ethyl dithiophosphate in acid media

Investigation of diethyl-dithio phosphate was carried out by using ''Allen's'' modified method of colorimetry, in aqueous medium from 0.1 to 7.0 mol dm(-3) HCl at 98 degrees C. Ionic strength data exhibit different contribution of neutral species and presence of acid catalysis. Theoretical rates estimated from 2nd empirical term of Debye-Huckel equation have been found in close agreement with experimental rates. Ionic strength, temperature, solvent and concentration of kinetic studies are provided to identify the reactive species and molecularity. Molecularity and bond fission are also discussed in terms of Zucker-Hammett hypothesis. Hammett acidity functions, Bunnet and Bunnett-Olsen parameters and isokinetic relationship.