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Identifiers | |||
3D model (JSmol)
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Properties | |||
HI(aq) | |||
Molar mass | 127.912 g·mol−1 (HI) | ||
Appearance | colorless liquid | ||
Odor | acrid | ||
Density | 1.70 g/mL, azeotrope (57% HI by weight) | ||
Boiling point | 127 °C (261 °F; 400 K) 1.03 bar, azeotrope | ||
Aqueous solution | |||
Acidity (pKa) | −9.3 (HI)[1] | ||
Hazards | |||
GHS labelling: | |||
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Danger | |||
H314 | |||
P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501 | |||
NFPA 704 (fire diamond) | |||
Flash point | Non-flammable | ||
Related compounds | |||
Other anions
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Related compounds
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Hydrogen iodide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hydroiodic acid (or hydriodic acid) is a colorless liquid. It is an aqueous solution of hydrogen iodide with the chemical formula HI(aq). It is a strong acid, in which hydrogen iodide is ionized completely in an aqueous solution. Concentrated aqueous solutions of hydrogen iodide are usually 48% to 57% HI by mass.[2]
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