Hydroiodic acid
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.
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| Names | |||
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| IUPAC name
Iodane | |||
| Other names
Hydronium iodide | |||
| Identifiers | |||
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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 | |||
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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) |
3
0
0 ACID | ||
| Flash point | Non-flammable | ||
| Related compounds | |||
Other anions |
Hydrofluoric acid Hydrochloric acid Hydrobromic acid | ||
Related compounds |
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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