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Mono Ammonium Phosphate

Ammonium dihydrogen phosphate (ADP), also known as monoammonium phosphate (MAP) is a chemical compound with the chemical formula (NH4)(H2PO4). ADP is a major ingredient of agricultural fertilizers and dry chemical fire extinguishers. It also has significant uses in optics and electronics.

Chemical properties

Monoammonium phosphate is soluble in water and crystallizes from it as the anhydrous salt in the tetragonal system, as elongated prisms or needles. It is practically insoluble in ethanol.

Solid monoammonium phosphate can be considered stable in practice for temperatures up to 200 °C, when it decomposes into gaseous ammonia NH
3
 and molten phosphoric acid H
3
PO
4
.At 125 °C the partial pressure of ammonia is 0.05 mm Hg.

A solution of stoichometric monoammonium phosphate is acidic (pH 4.7 at 0.1% concentration, 4.2 at 5%).

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Product Info

Ammonium dihydrogen phosphate[1]
Crystals of Ammonium Dihydrogen Phosphate
Names
IUPAC name

Ammonium dihydrogen phosphate
Other names

Monoammonium phosphate
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.028.877 Edit this at Wikidata
EC Number
  • 231-764-5
E number E342(i) (antioxidants, …)
PubChem CID
UNII

Properties
H6NO4P
Molar mass 115.025 g·mol−1
Appearance white crystals
Odor none
Density 1.80 g/cm3
Melting point 190 °C (374 °F; 463 K)
(g/dL) 28 (10 °C)
36 (20 °C)
44 (30 °C)
56 (40 °C)
66 (50 °C)
81 (60 °C)
99 (70 °C)
118 (80 °C)
173 (100 °C) [2][3]
Solubility insoluble in ethanol[2]
insoluble in acetone
1.525
Structure
tetragonal
Thermochemistry
−1445.07 kJ/mol[4]
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H319
P261P264P271P280P302+P352P304+P340P305+P351+P338P312P321P332+P313P337+P313P362P403+P233P405P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond

Health 1: Exposure would cause irritation but only minor residual injury. E.g. turpentine Flammability 0: Will not burn. E.g. water Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code
Lethal dose or concentration (LD, LC):
LD50 (median dose)
5750 mg/kg (rat, oral)
Related compounds
Other anions
Ammonium phosphate
Diammonium phosphate
Other cations
Monosodium phosphate
Potassium dihydrogen phosphate

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