Determination of the equilibrium constant for the triiodide ion formation using distribution coefficient and kinetics measurements

The equilibrium constant for the triiodide formation was studied and determined using distribution coefficient and kinetics measurements. the equilibrium constant of iodine between water and carbon tetracholride was previously determined at 25^o and values of 681 is obtained, also in this study the equilibrium will be determined by reaction between 3-chloroperbenzoic acid and potassium iodide under pseudo-first order condition using large excess of iodide. the best fit values for equilibrium constant that obtained from kinetics data at 25^o is 680, the result shows that this values are very close to that obtained from distribution coefficient measurement methods. this results show the usefulness of kinetics method for determining the equilibrium constant for this reaction.