Ammonium iodide

Ammonium iodide is the inorganic compound with the formula NH4I. A white solid. It is an ionic compound, although impure samples appear yellow. This salt consists of ammonium cation and an iodide anion. It can be prepared by the action of hydroiodic acid on ammonia. It is easily soluble in water, from which it crystallizes in cubes. It is also soluble in ethanol. Ammonium iodide in aqueous solutions are observed as acidic and display elevated vapor pressures at high temperatures

Ammonium iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.548
PubChem CID
UNII
  • InChI=1S/HI.H3N/h1H;1H3 Y
    Key: UKFWSNCTAHXBQN-UHFFFAOYSA-N Y
  • InChI=1/HI.H3N/h1H;1H3
    Key: UKFWSNCTAHXBQN-UHFFFAOYAU
SMILES
  • [I-].[NH4+]
Properties
NH4I
Molar mass 144.94 g/mol
Appearance White crystalline powder
Density 2.51 g/cm3
Melting point 551 °C (1,024 °F; 824 K) (sublimes)
Boiling point 235 °C (455 °F; 508 K) (in vacuum)
155 g/100 mL (0 °C)
172 g/100 mL (20 °C)
250 g/100 mL (100 °C)
Magnetic susceptibility (χ)
−66.0×10−6 cm3/mol
Hazards
NFPA 704 (fire diamond)
2
0
0
Flash point Non-flammable
Related compounds
Other anions
Ammonium fluoride
Ammonium chloride
Ammonium bromide
Other cations
Sodium iodide
Potassium iodide
Phosphonium iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references
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