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:

where:

P = the resultant dissociation pressure of ammonia

T = absolute temperature (K)