Kinetics of self decomposition of peroxydiyphosphate in aqueous ric acid medium

Abstract

Kinetics of self-decomposition of peroxydiphosphate in aqueous sulphuric acid medium at [H⁺]-0.2-1 M and µ=1.4M in the temperature range 40-70 ° has been investigated, The reaction is found to he first order each in [peroxydiphosphate] and [H⁺], It is found to catalyse the reaction strongly. Effects of temperature, ionic strength and added HPO^2- on the reaction rate have been studied. Evidence for free radical intermediate is provided by the initiation of vinyl polymerization. IR spectrum of polyacrylonitrile formed by the initiation of peroxy-diphosphate shows the presence of phosphate grouping. Kinetic and thermodynamic parameters, K_n(M^-1 sec^-1), A, E_n, ΔS⁺₊, etc, have evaluated and discussed with suitable reaction mechanism. A critical comparison is also made with similar work involving peroxydiphosphate.