Abstract
The rate and overall observed chemical change of the redox reaction between 2, 4, 6-trinitrophenol (TNP) and thiocyanate ion (SCN–) was investigated under a constant concentration of ionic strength, [????!] and λmax = 360 nm using a spectrophotometric titration method. The research aim is to study stoichiometry, order of reaction, the influence of acid, and the effect of change in ionic concentration on the reaction speed. The stoichiometry discovered gave a 1:2 molar proportion of TNP against SCN–. The reaction is 1st - order in relation to TNP and 1st – order in relation to SCN– hence, a 2nd -order overall for the system. An acid-dependence rate constant on TNP was positive for the TNP – SCN– system. A positive salt effect was observed in the system. An increase in the concentration of added cations and anions (Mn2+, NO3− and PO43−) had no influence on the speed of the reaction. The spectroscopic and kinetic results did not show any intermediate complex emergence all through the reaction. On grounds of the experimental results attained, a presumptive mechanism in favor of an outer-sphere mechanism has been recommended.
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