Ammonium phosphate

Ammonium phosphate

Names
IUPAC name ammonium phosphate
Other names triammonium phosphate
Identifiers
CAS Number	10361-65-6 Y
3D model (Jmol)	Interactive image
ChemSpider	140090 Y
ECHA InfoCard	100.030.709
UNII	2ZJF06M0I9 N
InChI InChI=1S/3H3N.H3O4P/c;;;1-5(2,3)4/h3*1H3;(H3,1,2,3,4) Y Key: ZRIUUUJAJJNDSS-UHFFFAOYSA-N Y InChI=1/3H3N.H3O4P/c;;;1-5(2,3)4/h3*1H3;(H3,1,2,3,4) Key: ZRIUUUJAJJNDSS-UHFFFAOYAA
SMILES [O-]P([O-])([O-])=O.[NH4+].[NH4+].[NH4+]
Properties
Chemical formula	(NH4)3PO4
Appearance	White, tetrahedral crystals
Solubility in water	58.0 g/100 mL (25 °C)
Hazards
NFPA 704	0 2 0
Thermochemistry
Std enthalpy of formation (ΔfHo298)	−1671.9 kJ/mol
Related compounds
Other cations	Trisodium phosphate Tripotassium phosphate
Related compounds	Diammonium phosphate Monoammonium phosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Ammonium phosphate is the salt of ammonium and phosphate. It is a highly unstable compound with the formula (NH₄)₃PO₄. Because of its instability, it is elusive and of no commercial value (except for scientific research). In addition to (NH₄)₃PO₄, a related double salt (NH₄)₂HPO₄ is also recognized. It too is unstable. The instability of these salts results in their facile decomposition with evolution of ammonia:

In contrast to the fragile nature of the triammonium salts, diammonium phosphate (NH₄)₂HPO₄ is a valuable material, mainly used as a fertilizer.