Solubility diagrams of the potassium iodide-water-ethanol and iodine-water-ethanol ternary systems

The solubility of potassium iodide and iodine in water-methanol mixed solvents was studied by the method of sections at 25°C and atmospheric pressure. The solubility of potassium iodide was found to decrease as the content of ethanol in aqueous-alcoholic solutions increased. The solubility of crystalline iodine had a complex dependence on mixed solvent composition; it was maximum in mixtures containing 90 wt % alcohol. The compositions of the solid phases that crystallized in the KI-H₂O-C₂H₅OH and I₂-H₂O-C₂H₅OH systems were substantiated by X-ray measurements.