Diammonium phosphate

Diammonium phosphate (DAP) (chemical formula (NH4)2HPO4, IUPAC name diammonium hydrogen phosphate) is one of a series of water-soluble ammonium phosphate salts that can be produced when ammonia reacts with phosphoric acid. Solid diammonium phosphate shows a dissociation pressure of ammonia as given by the following expression and equation: Diammonium phosphate (DAP) (chemical formula (NH4)2HPO4, IUPAC name diammonium hydrogen phosphate) is one of a series of water-soluble ammonium phosphate salts that can be produced when ammonia reacts with phosphoric acid. Solid diammonium phosphate shows a dissociation pressure of ammonia as given by the following expression and equation: ( NH 4 ) 2 HPO 4 ( s ) ↽ − − ⇀ NH 3 ( g ) + NH 4 H 2 PO 4 ( s ) {displaystyle {ce {(NH4)2HPO4(s) <=> NH3(g) + NH4H2PO4(s)}}} At 100 °C, the dissociation pressure of diammonium phosphate is approximately 5 mmHg.