Kinetics of reaction between phenothiazine dye/methylene green and peroxydisulphate ion in presence of bromide ion.
The rate of nuclear bromination was observed when the methylene green reacts with peroxydisulphate ion in presence of bromide ion. The reaction obeys zero order kinetics in the dye whereas first order kinetics in peroxodisulphate and bromide ion. The reaction was studied at various ionic strengths and temperatures to find out the effect of ionic strength on rate of nuclear brominating and energy of activation. The kinetics pertains to the rate determining stage of peroxydisulphate-bromide reaction. The study in different concentration of bromide and peroxydisulphate has shown that the rate constant increases by increasing the ionic strength and temperature of the system. The effect of ionic strength on the activation parameters was also studied.
Khalid
Z
Z
Department of Chemistry, University of Karachi, Karachi-75270, Pakistan.
Uddin
F
F
Azhar
S
S