Ammonium phosphate

Ammonium phosphate[1]
Names
IUPAC name
ammonium phosphate
Other names
triammonium phosphate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.709
UNII
Properties
(NH4)3PO4
Molar mass 149g
Appearance White, tetrahedral crystals
58.0 g/100 mL (25 °C)
Hazards
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
0
2
0
Thermochemistry
−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).
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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:[2]

(NH4)3PO4 → (NH4)2HPO4 + NH3

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

See also

References

  1. ↑ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: CRC Press. pp. 4–42, 5–19. ISBN 0-8493-0594-2.
  2. ↑ Klaus Schrödter, Gerhard Bettermann, Thomas Staffel, Friedrich Wahl, Thomas Klein, Thomas Hofmann "Phosphoric Acid and Phosphates" in Ullmann’s Encyclopedia of Industrial Chemistry 2008, Wiley-VCH, Weinheim. doi:10.1002/14356007.a19_465.pub3
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