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Hydroiodic acid

Names Other names Aqueous hydrogen iodideHydriodic acidHydrogen iodide, hydrousHydronium iodideIdentifiers CAS Number10034-85-23D model (JSmol)Interactive imageChEBICHEBI:43451ChemSpider23224EC Number233-109-9PubChemCID24841RTECS numberMW3760000UNII694C0EFT9QInChIInChI=1S/BrH/h1HKey: CPELXLSAUQHCOX-UHFFFAOYSA-NInChI=1/BrH/h1HKey: CPELXLSAUQHCOX-UHFFFAOYAZSMILES[OH3+].[I-]Properties Chemical formulaHI(aq) Molar mass127.912 g·mol (HI) Appearance colorless liquid when pure, darkens on exposure to oxygen Odoracrid Density1.70 g/mL, azeotrope(57% HI by weight) Boiling point127 °C (261 °F; 400 K) 1.03 bar, azeotrope Solubility in waterAqueous solution Acidity (pKa) −9.3 (HI) Hazards GHS labelling: PictogramsSignal wordDangerHazard statementsH314Precautionary statementsP260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501NFPA 704 (fire diamond) 300ACIDFlash pointNon-flammable Related compounds Other anionsHydrofluoric acidHydrochloric acidHydrobromic acidRelated compoundsHydrogen iodideExcept where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Hydroiodic acid (or hydriodic acid) is a colorless aqueous solution of hydrogen iodide.

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