Review and Improved Technique of the Initial Rate Method
Review and Improved Technique of the Initial Rate Method

Summary/Abstract: It is claimed that, in certain circumstances, initial-rate method (IRM) has advantages over the integral method (IM). But, the IRM will only be effective if the con¬centration change is less than 5 % and the rate constant (k) obtained should be checked with IM. There are two main purposes of this research. First, to prove that the claim is invalid and the IRM can be used on broader concentration changes. In addition, the rate law model used in the claimed is invalid for reaction that takes place in two mechanisms. Second, to find a new form of IRM equation, which does not require IM checks. This study used the oxidation of formic acid with bromine as a reaction model. The values of n and k of this reaction at two mechanisms were determined by the IM, and then by the conventional IRM, the method used in the claim, and by the new IRM generated by this study. All of k values are compared by using IM as the standard. The proposed method is claimed valid if the error percentage of k is less than 5 %. Despite the shortcomings, the results show that the new IRM is valid and more reliable.

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