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Ammonium phosphate
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<p>Ammonium phosphate is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Formula/BosTcKnv">formula</a> (NH4)3PO4. It is the ammonium <a href="/facts/Salt_(chemistry)/lsSKwGpn">salt</a> 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 <a href="/facts/Diammonium_phosphate/97lDTQpT">diammonium phosphate</a> (NH4)2HPO4 and <a href="/facts/Monoammonium_phosphate/HYa8DmMo">monoammonium salt</a> (NH4)H2PO4 are stable materials that are commonly used as fertilizers to provide plants with fixed nitrogen and phosphorus. </p><p>Ammonium phosphate is the main ingredient in pink fire retardant. </p>