20Jan 2017

A KINETIC STUDY OF THE OXIDATION OF NITRITE ION BY PEROXODISULPHATE.

  • Assistant Professor, Chemistry Department, Faculty of Education, Khartoum university, P.O.Box406 Omdurman-Sudan. Professor, Head, Teachers’ Research Resource Unit (RRSU), Ahfad University for Women. Associate Professor, Chemistry Department, Faculty of Education, Khartoum university, P.O.Box406 Omdurman-Sudan.
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The oxidation of nitrite ion NO2 by Peroxodisulphate ion S2O82- was studied in high ionic strength and in phosphate and acetate media at around pH=7 and 600C . Under controlled conditions the reaction is of overall second order being first order with respect to reactants. Cations (Na+, K+, Ca+2, Mg+2 and Cu+2 catalyze the reaction and the extent of catalysis depends on the nature and concentration of the cations.The temperature effect on the redox reactions was studied and the activation energy is 60.01 kJmol-1. The mechanism has been proposed. Based on experimental data and kinetic simulation, we have modified previous models for this reaction mechanism and show that the new model proposed here is consistent with experimental data. The stoichiometry was determined to be:- S2O82- + NO2- 2SO42- + NO3- + 2H+ (1) And the experimental rate law is: R0=k1[S2O82-]0+k20[S2O82-]0 [NO2-]0+{?kMin+[Mn+]}[S2O82-]0[NO2-]0 (2)


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[Eeljali Elobeid Elhassan, Salah edin Mohamed Elamin and Ibrahim Mukhtar Ahmed. (2017); A KINETIC STUDY OF THE OXIDATION OF NITRITE ION BY PEROXODISULPHATE. Int. J. of Adv. Res. 5 (1). 371-377] (ISSN 2320-5407). www.journalijar.com


Dr. ELJALI ELOBEID ELHASSAN
Chemistry Department, Faculty of Education, Khartoum University,

DOI:


Article DOI: 10.21474/IJAR01/2756       DOI URL: http://dx.doi.org/10.21474/IJAR01/2756


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