Ammonium iodide
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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.[1] 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[2]
Quick Facts Identifiers, Properties ...
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.031.548 | ||
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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) | |||
−66.0×10−6 cm3/mol | |||
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NFPA 704 (fire diamond) | |||
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).
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