Iodic Acid
Title: Iodic Acid
CAS Registry Number: 7782-68-5
Molecular Formula: HIO3
Molecular Weight: 175.91
Percent Composition: H 0.57%, I 72.14%, O 27.29%
Literature References: Prepd by the oxidation of iodine with nitric acid, perchloric acid, or hydrogen peroxide: Baxter, Tilley, Z. Anorg. Allg. Chem. 61, 295 (1909); Lamb et al., J. Am. Chem. Soc. 42, 1643 (1920); Bray, Caulkins, ibid. 53, 44 (1931). Electrolytic method: Willard, Ralston, Trans. Am. Electrochem. Soc. 62, 239 (1932).
Properties: Orthorhombic crystals. Darkens upon exposure to light. d40 4.629. mp 110° (dec). Decompn to HIO3.I2O5 starts at 70° and decompn to I2O5 is complete at 220°. Not hygroscopic, yet very freely sol in water: 269 g/100 ml H2O at 20°; 295 g/100 ml H2O at 40°. Density of aq solns (w/w) at 18°: 1% = 1.0071; 10% = 1.0900; 20% = 1.1969; 40% = 1.4640; 75% = 2.4710. Strong electrolyte, especially when dil. Sol in nitric acid, dil alcohol. Insol in abs alc, ether, chloroform. Keep well closed and protected from light.
Melting point: mp 110° (dec)
Density: d40 4.629; Density of aq solns (w/w) at 18°: 1% = 1.0071; 10% = 1.0900; 20% = 1.1969; 40% = 1.4640; 75% = 2.4710
Therap-Cat: Astringent, disinfectant.
Keywords: Antiseptic/Disinfectant; Halogens/Halogen Containing Compounds; Astringent.

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