Diammonium phosphate (DAP) (chemical formula (NH
4)
2HPO
4,
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)