Ammonium iodide

A chemical compound

3D model of ammonium iodide

Ammonium iodide is a chemical compound with the formula NH_I. It is the salt of ammonia and hydroiodic acid.

Properties

Ammonium iodide is a white crystalline solid that is highly soluble in water. It is hygroscopic, meaning it readily absorbs moisture from the air, which can lead to the compound becoming damp or even liquefied if exposed to humid conditions.

Preparation

Ammonium iodide can be prepared by the reaction of ammonia with hydroiodic acid:

NH_ + HI _ NH_I

This reaction is typically carried out in an aqueous solution, and the resulting ammonium iodide can be crystallized by evaporation of the solvent.

Uses

Ammonium iodide is used in various applications, including:

• As a source of iodide ions in chemical reactions.
• In photography, as a component of some photographic chemicals.
• In medicine, as an expectorant in cough syrups.

Safety

Ammonium iodide should be handled with care, as it can release toxic ammonia gas upon decomposition. It should be stored in a cool, dry place to prevent it from absorbing moisture and decomposing.

Related pages

• Ammonium chloride
• Ammonium bromide
• Ammonium sulfate
• Iodide