. Carnegie Institution of Washington publication. POTASSIUM IODIDE. 95 noticed, however, that the solution had a high colora- tion, which deepened on standing. Moreover, there was a slight deposit formed at the same time. On evapo- ration the residue was still colored. The strongest solu- tions of the sodium iodide, in acetone, gave a test for iodine with starch paste, while the more dilute solu- tions, though still somewhat colored, gave none. Free iodine was then added to pure acetone until the same color was reproduced. This solution, tested with starch 140- 130- 120- 110- 100- '> 90- '•
. Carnegie Institution of Washington publication. POTASSIUM IODIDE. 95 noticed, however, that the solution had a high colora- tion, which deepened on standing. Moreover, there was a slight deposit formed at the same time. On evapo- ration the residue was still colored. The strongest solu- tions of the sodium iodide, in acetone, gave a test for iodine with starch paste, while the more dilute solu- tions, though still somewhat colored, gave none. Free iodine was then added to pure acetone until the same color was reproduced. This solution, tested with starch 140- 130- 120- 110- 100- '> 90- '•3 o -§ 80- o | GOJ "o ^ 50- 40 30- 20- 10- 120- .110 100 FIG. 30.—CONDUCTIVITY OF POTASSIUM IODIDE IN MIXTURES OF ACETONE AND ETHYL ALCOHOL AT 0°.. FIG. 31. — CONDUCTIVITY OF POTASSIUM IODIDE IN MIXTURES OF ACETONE AND ETHYL ALCOHOL AT 25°.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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