Potassium Triiodide
Title: Potassium Triiodide
CAS Registry Number: 7790-42-3
Molecular Formula: I3K
Molecular Weight: 419.81
Percent Composition: I 90.69%, K 9.31%
Literature References: Monohydrate prepd by adding the stoichiometric amount of iodine to a hot soln of KI and cooling to 0°: H. L. Wells, H. L. Wheeler, Z. Anorg. Allg. Chem. 1, 453 (1892); H. W. Foote, W. C. Chalker, J. Am. Chem. Soc. 39, 565 (1908). Prepn of anhydrous: N. S. Grace, J. Chem. Soc. 1931, 594.
Properties: Reasonably stable only as the monohydrate, dark brown, hygroscopic, monoclinic prisms. d415 3.498. mp 38° (closed tube). Gives off iodine at 225°, leaving KI. "Incongruently" sol in water, sol (with partial decompn) in alcohol, ether.
Melting point: mp 38° (closed tube)
Density: d415 3.498
Status: This monograph has been retired and is no longer subject to revision or update.

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