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Names | |||
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IUPAC name
Iodane
[1]
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Other names
Hydronium iodide
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Identifiers | |||
3D model (
JSmol)
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ChEBI | |||
ChemSpider | |||
EC Number |
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PubChem
CID
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RTECS number |
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UNII | |||
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Properties | |||
HI(aq) | |||
Molar mass | 127.91 g/mol | ||
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 | ||
Hazards | |||
GHS labelling: | |||
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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Hydrofluoric acid Hydrochloric acid Hydrobromic acid | ||
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 and aqueous solution of hydrogen iodide (HI). It is a strong acid, which is ionized completely in an aqueous solution. Concentrated solutions of hydroiodic acid are usually 48% to 57% HI. [2]
Hydroiodic acid reacts with oxygen in air to give iodine:
Like other hydrogen halides, hydroiodic acid adds to alkenes to give alkyl iodides. It can also be used as a reducing agent, for example in the reduction of aromatic nitro compounds to anilines. [3]
The Cativa process is a major end use of hydroiodic acid, which serves as a co-catalyst for the production of acetic acid by the carbonylation of methanol. [4] [5]
Hydroiodic acid is listed as a U.S. Federal DEA List I Chemical, owing to its use as a reducing agent related to the production of methamphetamine from ephedrine or pseudoephedrine (recovered from nasal decongestant pills). [6]