File:Hydrogen-iodide-2D-dimensions.svg · Wikimedia Commons · See Wikimedia Commons
Chemical data
- Formula
- HI
- Molecular weight
- 127.9124 g/mol
- IUPAC name
- hydron iodide
- SMILES
- [H+].[I-]
- InChIKey
- XMBWDFGMSWQBCA-UHFFFAOYSA-N
- Polar surface area
- 0 Ų
- H-bond donors
- 1
- H-bond acceptors
- 1
- Formal charge
- 0
via PubChem
Wikidata facts
- Subclass of
- hydrogen halide
- Has part
- iodine
- Mass
- 127.9123
Show 14 more facts
- chemical formula
- HI
- canonical SMILES
- I
- speed of sound
- 157
- different from
- hydroiodic acid
- melting point
- -50.77
- boiling point
- -35.55
- decomposition point
- 300
- standard enthalpy of formation
- 26.6
- pKa
- -11
- Commons category
- Hydrogen iodide
- standard molar entropy
- 206.6
- found in taxon
- Homo sapiens
- ionization energy
- 10.39
- electric dipole moment
- 0.448
via Wikidata · CC0
~6 min read
Encyclopedic overview
Hydrogen iodide (HI) is a diatomic molecule and hydrogen halide. Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid. Hydrogen iodide and hydroiodic acid are, however, different in that the former is a gas under standard conditions, whereas the latter is an aqueous solution of the gas. They are interconvertible. HI is used in organic and inorganic synthesis as one of the primary sources of iodine and as a reducing agent.
Properties of hydrogen iodide
Excerpted from Wikipedia’s “hydrogen iodide” article, available under the CC BY-SA 4.0 licence.