Ammonium phosphate Ammonium phosphate is an ammonium salt of orthophosphoric acid. It is a highly unstable compound with the formula (NH 4 ) 3 PO 4 . Because of its instability, it is elusive and of no commercial value. A related "double salt", (NH 4 ) 3 PO 4 . (NH 4 ) 2 HPO 4 is also recognized but is too unstable for practical use. Both triammonium salts evolve ammonia. In contrast to the unstable nature of the triammonium salts, the diammonium phosphate (NH 4 ) 2 HPO 4 monoammonium salt (NH 4 )H 2 PO 4, are stable materials that are commonly used as fertilizers to provide plants with fixed nitrogen and phosphorus. PREPARATION OH AMMONIUM TRIPHOSPHATE Triammonium phosphate can be prepared in the laboratory by treating 85% phosphoric acid with 30% ammonia solution: ...
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