Ammonium iodide


Ammonium iodide
Ammonium iodide
Identifiers
CAS number 12027-06-4 YesY
ChemSpider 23785 YesY
UNII OZ8F027LDH YesY
Jmol-3D images Image 1
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
NFPA 704.svg
0
2
0
Flash point Non-flammable
Related compounds
Other anions Ammonium fluoride
Ammonium chloride
Ammonium bromide
Other cations Sodium iodide
Potassium iodide
 YesY iodide (verify) (what is: YesY/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.



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