tion of potassium hydroxide. The sample bottle was immersed in a water-bath from two to seven days and samples removed as convenient for analysis. The alkalinity was determined by titration with sulfuric acid solution using methyl orange indicator. The iodide content was determined gravimetrically as silver iodide. The density was determined by weighing a 25-ml. sample of the saturated solution. Weights were cor rected for the buoyant effect of air. All chemicals used were of Reagent grade.Equilibrium seemed to be quickly attained from the supersaturated condition. In certain experiments, equilibrium was approached from the uti dersaturated side and no significant variation in solubility was found.From a number of titrations for alkalinity in the equilibrium mixtures, it was determined that about 1% of the total alkalinity was in the form of carbonate. To estimate the magnitude of the effect of this impurity on the solubility determinations, one solution was prepared with added carbonate to give a carbonate alkalinity of 0.40 N in a total alkalinity of 6.453 N., i.e., 6.2%. The solubility point determined for this solution lies on the smooth curve drawn through the other experimental points, indicating that small proportions of carbonate are without appreciable effect on the solubility determinations.
SummaryThe solubility of potassium iodide at 20°w as determined in potassium hydroxide solutions from 0 to 14.35 N in alkali. The density and solubility curves show no discontinuities.The accuracy of the results is estimated to be 0.5%.
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