Ammonium iodide
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| Ammonium iodide | |
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| Identifiers | |
| CAS number | 12027-06-4  |
| ChemSpider | 23785 |
| UNII | OZ8F027LDH |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | NH4I |
| Molar mass | 144.94 g/mol |
| Appearance | White crystalline powder |
| Density | 2.51 g/cm3 |
| Melting point |
551 °C (sublimes) |
| Boiling point |
235 °C (in vacuum) |
| Solubility in water | 155 g/100 mL (0 °C) 172 g/100 mL (20 °C) 250 g/100 mL (100 °C) |
| Hazards | |
| EU Index | Not listed |
| NFPA 704 |
 0
2
0
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| Flash point | Non-flammable |
| Related compounds | |
| Other anions | Ammonium fluoride Ammonium chloride Ammonium bromide |
| Other cations | Sodium iodide Potassium iodide |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Ammonium iodide is the chemical compound NH4I. It is used in photographic chemicals and some medications.[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. It gradually turns yellow on standing in moist air, owing to decomposition with liberation of iodine.[1]
[edit] Preparation
Ammonium iodide can be made in lab by reacting ammonia or ammonium hydroxide with hydroiodic acid or hydrogen iodide gas:
- NH3 + HI → NH4I
[edit] References
- ^ a b Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
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