Kinetics and Mechanism of Hydrolysis of Mono-p-sulphonic Acid Aniline Phosphate in Acid Media

Abstract

Investigation of mono-p-sulphonic acid aniline 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 98ºC. Ionic

strength data exhibit different contribution of neutral species and

presence of acid catalysis. Theoretical rates estimated from second

empirical term of Debye-Hückel equation have been found in close

agreement with experimental rates. The effects of ionic strength,

temperature, solvent and concentration are provided to identify the

reactive species and molecularity. Bimolecular behaviour has been

decided by the Arrhenius parameters and by the analysis of

molecularity data. The monoester involves P—N bond fission which

is strengthened by comparative kinetic data.