Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material

Anotations

Scope note:

The hydroxy salt of ammonium ion, formed when ammonia reacts with water molecules in solution. It is an alkaline solution containing around 28.5% ammonia by weight, highly soluble in water. For solutions containing this substance, use "ammonia water," though usage overlaps because ammonium hydroxide always or almost always exists only in solution.