Ammonium phosphate
| Names | |
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| IUPAC name
ammonium phosphate
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| Other names
triammonium phosphate
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| (NH4)3PO4 | |
| Molar mass | 149.09 g/mol |
| Appearance | White, tetrahedral crystals |
| 58.0 g/100 mL (25 °C) | |
| Solubility | Insoluble in acetone[2] |
| Hazards | |
| GHS labelling: | |
| GHS07: Exclamation mark | |
| Warning | |
| H302, H319 | |
| P264, P270, P280, P301+P312, P305+P351+P338, P330, P337+P313, P501 | |
| NFPA 704 (fire diamond) | |
| Thermochemistry | |
Std enthalpy of
formation (ΔfH⦵298) |
−1671.9 kJ/mol |
| Related compounds | |
Other cations
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Trisodium phosphate Tripotassium phosphate |
Related compounds
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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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Ammonium phosphate is the inorganic compound with the formula (NH4)3PO4. It is the ammonium salt of orthophosphoric acid. A related double salt, (NH4)3PO4.(NH4)2HPO4 is also recognized but is impractical to use. Both triammonium salts evolve ammonia. In contrast to the unstable nature of the triammonium salts, the diammonium phosphate (NH4)2HPO4 and monoammonium salt (NH4)H2PO4 are stable materials that are commonly used as fertilizers to provide plants with fixed nitrogen and phosphorus.[3]
Ammonium phosphate is the main ingredient in pink fire retardant. [4]
Preparation of triammonium phosphate
[edit | edit source]Triammonium phosphate can be prepared in the laboratory by treating 85% phosphoric acid with 30% ammonia solution:[citation needed]
- H3PO4 + 3 NH3 → (NH4)3PO4
(NH4)3PO4 is a colorless, crystalline solid. The solid, which has the odor of ammonia, is readily soluble in water. The salt converts to diammonium hydrogen phosphate (NH4)2HPO4.
See also
[edit | edit source]References
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