The solubility of iodine in water and in deuterium oxide has been determined in the range 5-50°u sing packedcolumn techniques, and the thermodynamic results are compared for the two solvents. The solubility of iodine in very dilute potassium iodide solutions leads inherently to apparent values of the triiodide formation constant which are higher than those obtained by precise spectrophotometric work at exceedingly low concentrations.
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