Abstract
The equilibrium is established by dissolving iodine in a solution of KI of known concentration. The total I2 and 13concentration a t equilihrium is determined by titrating the aqueous solution with thiosulfate (2). The solution is then extracted with carbon tetrachloride, and the I2 concentration in the nonpolar solvent is determined by titration with thiosulfate. The equilibrium concentration of 12 in the aqueous solution can he calculated from the I? concentration in the nonpolar solvent and the distribution coefficient for the extraction of iodine between CCla and water.
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