Ammonium hydroxide
A solution of ammonia in water. — ChEBI
Safety documents & references
1 indexed referencesFind a product-specific SDS
Safety guides and government classification records are not a manufacturer’s SDS. Match supplier, product number, concentration, physical form, region and revision before using a document.
Identity & molecular properties
Source-linked values| CAS number | 1336-21-6 | ChEBI ↗ |
| Molecular formula | H4N.HO | ChEBI ↗ |
| Molar mass | 35.046 g/mol | ChEBI ↗ |
| Monoisotopic mass | 35.03711 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:18219 | ChEBI ↗ |
Names & structural identifiers
Copy any identifierammonium hydroxideammonium hydroxideVHUUQVKOLVNVRT-UHFFFAOYSA-N[NH4+].[OH-]InChI=1S/H3N.H2O/h1H3;1H2Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.
Safety classification · Japan
NITE / Japanese governmentAmmonium hydroxide · R03-C-032B-MOE
| Endpoint | Reported classification |
|---|---|
| Hazardous to the aquatic environment （Acute） | Category 3 |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 35.046 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsONHCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
Selected source associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.