Determination of the Reaction Order and Rate Constant for the Reaction of Malachite Green with Hydroxyl Ions

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Determination of the Reaction Order and Rate Constant for the reaction of Malachite Green with hydroxyl ions Abstract. This experiment was to show the absorbance of malachite green at its λmax which is proportional to concentration of part A. For Part b to show reaction of first order with respect to malachite green and determination to the pseudo first order rate constant at room temperature. Also to show the reaction which is the first order with respect to sodium hydroxide and determine the overall second order rate constant at room temperature. Introducation. The reaction rate rarely measured directly using differential rate law because of the difficulty in determining accurate values of slope. Instead integrated rate laws used which expresses kinetics behaviour directly in terms of measurable observables of concentration and time. The integrated rate laws is simple and the advantage of using of it is that order of reaction with respect to a given reactant is readily tested by means of the appropriate plot of reactant concentration against time. The isolation method is a common method of simplifying the rate law when more that one reactant is involved is to arrange for all the reactants except one to be present in such large excess that their concentration can be regarded as remaining effectively constant throughout the reaction. Isolation method also means that many reaction can be studied under pseudo law for a first order reaction there is no need to know the absolute concentration of reactant but

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