KINETICS AND MECHANISMS OF THE REDOX REACTIONS OF 2,6-DICHLOROPHENOL INDOPHENOL WITH OXYANIONS, HYDRAZINE AND HYDROGEN PEROXIDE IN AQUEOUS MEDIUM

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dc.contributor.authorILIYASU, Suleiman Sani
dc.date.accessioned2019-09-23T13:49:20Z
dc.date.available2019-09-23T13:49:20Z
dc.date.issued2018-02
dc.descriptionA DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE AWARD OF A MASTER OF SCIENCE DEGREE IN INORGANIC CHEMSTRY DEPARTMENT OF CHEMISTRY FACULTY OF PHYSICAL SCIENCES AHMADU BELLO UNIVERSITY, ZARIA NIGERIA.en_US
dc.description.abstractThe kinetics of the redox reactions of 2,6-dichlorophenol indophenol (DCPIP) by metabisulphite ions (S2O52-), sulphite ions (SO32-), hydrazine (N2H4) and hydrogen peroxide (H2O2) at 28 ± 1 °C was studied at λmax of 600 nm in aqueous medium under pseudo-first order conditions at I = 0.2 mol dm-3 (NaCl). The stoichiometry of 1:1 was obtained for all the reactions except DCPIP - S2O52- which was 2:1. The reactions were first order in [S2O52-], [N2H4], [H2O2] and zero order with respect to [SO32-]. The reactions conform to the following rate equations: d[DCPIP]= k2 [DCPIP] [S2O52-] dt where k2 = 16.24 ± 0.03 dm3 mol-1 s-1 d[DCPIP]= k1[DCPIP] dt where k1 = 1.79 ± 0.02 dm3 mol-1 s-1 d[DCPIP]= k2 [DCPIP] [N2H4] dt where k2 = 0.13 ± 0.02 dm3 mol-1 s-1 d[DCPIP]= k2[DCPIP] [H2O2] dt where k2 = 3.01 ± 0.02 dm3 mol-1 s-1. The rates of reactions displayed negative salt effect for DCPIP - S2O52- reaction, positive salt effect for DCPIP - N2H4 reaction and zero salt effect for DCPIP - SO32- and DCPIP - H2O2 reactions. Added cations catalysed the reaction of DCPIP - S2O52- but had no significant effect in the reactions of DCPIP - SO32-, DCPIP - N2H4 and DCPIP - H2O2. While added anions had negligible effect for all the reactions except DCPIP - N2H4 reaction. There was no evidence of formation of intermediate complex of significant stability for any of the reactions. Free radicals were not detected in all the reactions. Based on the results obtained in these studies, outer-sphere mechanism was proposed for the reactions of DCPIP with S2O52-, SO32- , H2O2 and inner-sphere mechanism for the reaction of DCPIP with N2H4.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/11988
dc.language.isoesen_US
dc.subjectKINETICS,en_US
dc.subjectMECHANISMS,en_US
dc.subjectREDOX REACTIONS,en_US
dc.subject2,6-DICHLOROPHENOL INDOPHENOL,en_US
dc.subjectOXYANIONS,en_US
dc.subjectHYDRAZINE,en_US
dc.subjectHYDROGEN PEROXIDE,en_US
dc.subjectAQUEOUS MEDIUM,en_US
dc.titleKINETICS AND MECHANISMS OF THE REDOX REACTIONS OF 2,6-DICHLOROPHENOL INDOPHENOL WITH OXYANIONS, HYDRAZINE AND HYDROGEN PEROXIDE IN AQUEOUS MEDIUMen_US
dc.typeThesisen_US
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