ISSN 0331-8753
 

Original Research 


Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium

Ameh David Onu, Suleiman Ola Idris, Yusuf Ahmad.

Abstract
The kinetics of oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate(II) complex (〖[Co(II)EDTA]〗^(2-)) by silver-activated persulphate ion in aqueous nitric acid medium was studied at I = 0.5 mol dm-3(NaNO3)1/6/2017 11:57:00 AM, [H+] = 1 10-2 mol dm-3, [Ag+] = 1 10-2 mol dm-3, T = 299 1 K and λmax = 520 nm. Stoichiometric study showed 2:1 (Reductant: Oxidant) mole ratio. The reaction exhibited first order with respect to [Co(II)EDTA2-] and [ ] and the rate constant, k_2(5.90 10-2 dm3mol-1s-1) was independent acid concentration, but varied linearly with catalyst concentration, [Ag+]. The overall rate law is represented as:
(d[Co(III)EDTA^-])/dt= 5.90 〖10〗^(-2) 〖[Ag〗^+][〖Co(II)EDTA〗^(2-) ][S_2 O_8^(2-)]
The reaction displayed zero salt effect suggesting an activated complex composed of either a neutral-Charged, neutral-neutral reactant species or ion-pair. The reaction was catalysed by addition of formate ion, HCOO- and the Michaelis-Mentens plot gave zero intercept indicating the absence of intermediate complex. Also the activation enthalpy (〖ΔH〗^⋕= +39.27 KJ mol-1) and entropy (〖ΔS〗^⋕= -136.73 J K-1 mol-1) were determined. The entropy of activation shows a more ordered activated complex relative to the reactants species. Evaluating the experimental data, an outer-sphere mechanistic pathway via ion pair activated complex is proposed for the reaction.

Keywords: Kinetics, Oxidation, Aminocarboxylactocobaltate(II), persulphate ion

Key words: Kinetics, Oxidation, Aminocarboxylactocobaltate(II), persulphate ion


 
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Pubmed Style

Onu AD, Idris SO, Ahmad Y. Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium. Nig. J. Basic Appl. Sci.. 2018; 26(2): 45-53. doi:10.4314/njbas.v26i2.7


Web Style

Onu AD, Idris SO, Ahmad Y. Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium. www.njbas-udus.com/?mno=286963 [Access: May 19, 2019]. doi:10.4314/njbas.v26i2.7


AMA (American Medical Association) Style

Onu AD, Idris SO, Ahmad Y. Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium. Nig. J. Basic Appl. Sci.. 2018; 26(2): 45-53. doi:10.4314/njbas.v26i2.7



Vancouver/ICMJE Style

Onu AD, Idris SO, Ahmad Y. Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium. Nig. J. Basic Appl. Sci.. (2018), [cited May 19, 2019]; 26(2): 45-53. doi:10.4314/njbas.v26i2.7



Harvard Style

Onu, A. D., Idris, . S. O. & Ahmad, . Y. (2018) Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium. Nig. J. Basic Appl. Sci., 26 (2), 45-53. doi:10.4314/njbas.v26i2.7



Turabian Style

Onu, Ameh David, Suleiman Ola Idris, and Yusuf Ahmad. 2018. Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium. Nigerian Journal of Basic and Applied Sciences, 26 (2), 45-53. doi:10.4314/njbas.v26i2.7



Chicago Style

Onu, Ameh David, Suleiman Ola Idris, and Yusuf Ahmad. "Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium." Nigerian Journal of Basic and Applied Sciences 26 (2018), 45-53. doi:10.4314/njbas.v26i2.7



MLA (The Modern Language Association) Style

Onu, Ameh David, Suleiman Ola Idris, and Yusuf Ahmad. "Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium." Nigerian Journal of Basic and Applied Sciences 26.2 (2018), 45-53. Print. doi:10.4314/njbas.v26i2.7



APA (American Psychological Association) Style

Onu, A. D., Idris, . S. O. & Ahmad, . Y. (2018) Kinetics of Oxidation of Ethylenediammine-N,N,N,N-tetraacetatocobaltate (II) complex by Silver-activated Persulphate ion in Aqueous Acidic Medium. Nigerian Journal of Basic and Applied Sciences, 26 (2), 45-53. doi:10.4314/njbas.v26i2.7





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