Ammonium phosphate
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| Template:Longitem | (NH4)3PO4 |
| Molar mass | 149.09 g/mol |
| Appearance | White, tetrahedral crystals |
| Solubility | Insoluble in acetone[2] |
| NFPA 704 (fire diamond) | Template:NFPA 704 diamond |
| Template:Longitem | −1671.9 kJ/mol |
| Template:Longitem | Trisodium phosphate Tripotassium phosphate |
| Template:Longitem | Diammonium phosphate Monoammonium phosphate |
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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
Triammonium phosphate can be prepared in the laboratory by treating 85% phosphoric acid with 30% ammonia solution:Script error: No such module "Unsubst".
- 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
References
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