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Chemical substance record

Ammonium magnesium phosphate

7785-21-9H₄N.Mg.O₄P137.314 g/mol

Salt and Compound WithChEBI source record

An inorganic phosphate that is the ammonium magnesium salt of phosphoric acid. — ChEBI

Safety references

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Identity & molecular properties

Source-linked values

CAS number	7785-21-9	ChEBI ↗
Molecular formula	H₄N.Mg.O₄P	ChEBI ↗
Molar mass	137.314 g/mol	ChEBI ↗
Monoisotopic mass	136.97284 Da	ChEBI ↗
Formal charge	0	ChEBI ↗
ChEBI identifier	CHEBI:149425	ChEBI ↗

Cross-source molecular data

PubChem

Molar mass	137.32 g/mol	PubChem ↗
Exact mass	136.9728363 Da	PubChem ↗

PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.

Names & structural identifiers

Copy any identifier

Source preferred name

ammonium magnesium phosphate

IUPAC name

ammonium magnesium phosphate

InChIKey

MXZRMHIULZDAKC-UHFFFAOYSA-L

SMILES

O=P([O-])([O-])[O-].[Mg+2].[NH4+]

InChI

InChI=1S/Mg.H3N.H3O4P/c;;1-5(2,3)4/h;1H3;(H3,1,2,3,4)/q+2;;/p-2

Classification & relationships

ChEBI ontology

inorganic phosphateChEBI parent class · 24838 ↗magnesium saltChEBI parent class · 33975 ↗ammonium saltChEBI parent class · 47704 ↗

inorganic molecular entity

Roles recorded in ChEBI

fertilizer

Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.

Mass ↔ amount of substance

Calculated from sourced mass

Amount

Input unit

Equivalent amount

0.00728258 mol

Uses 137.314 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.

Elemental composition

Theoretical mass fractions

O

Oxygen · 4 atoms

46.61%

P

Phosphorus · 1 atom

22.56%

Mg

Magnesium · 1 atom

17.70%

N

Nitrogen · 1 atom

10.20%

H

Hydrogen · 4 atoms

2.94%

Calculated 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 associations

Formation of ammonium magnesium phosphate crystals in cultures of fungi growing on keratin. ↗Mycopathologia et mycologia applicata · 1962 Oct 10 · PMID 13962306

[Long ureteral ammonium-magnesium phosphate (struvite) and calcium phospho-carbonate calculi]. ↗Journal d'urologie · 1991 · PMID 1804876

CN101081770 · Patent reference ↗Patent cross-reference supplied by ChEBI. Association alone does not establish claim scope.

CN1686965 · Patent reference ↗Patent cross-reference supplied by ChEBI. Association alone does not establish claim scope.

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Sources & record history

Checked 27 Sep 2026

Identity, formula, mass, synonyms & ontologyEMBL-EBI ChEBI · CHEBI:149425

Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0

Additional molecular descriptorsNCBI PubChem · CID 178727 · retrieved 2026-09-27

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.

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