Ammonium iodide

Ammonium iodide
Identifiers
CAS number	12027-06-4 Y
ChemSpider	23785 Y
UNII	OZ8F027LDH Y
Jmol-3D images	Image 1
SMILES [I-].[NH4+]
InChI InChI=1S/HI.H3N/h1H;1H3 Y Key: UKFWSNCTAHXBQN-UHFFFAOYSA-N Y InChI=1/HI.H3N/h1H;1H3 Key: UKFWSNCTAHXBQN-UHFFFAOYAU
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
Flash point	Non-flammable
Related compounds
Other anions	Ammonium fluoride Ammonium chloride Ammonium bromide
Other cations	Sodium iodide Potassium iodide
Y iodide (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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]

Preparation

Ammonium iodide can be made in lab by reacting ammonia or ammonium hydroxide with hydroiodic acid or hydrogen iodide gas:

NH₃ + HI → NH₄I

NH₄OH + HI → NH₄I + H₂O

References

1. ^ ^{a b} Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.