Ammonium dihydrogen phosphate

Structural formula
General
Surname	Ammonium dihydrogen phosphate
other names	Ammonium dihydrogen phosphate Monoammonium phosphate Ammonium dihydrogen orthophosphate Monoammonium orthophosphate Ammonium biphosphate
Molecular formula	(NH 4 ) H 2 PO 4
Brief description	colorless and odorless solid
External identifiers / databases
CAS number 7722-76-1 EC number 231-764-5 ECHA InfoCard 100,028,877 PubChem 24402 Wikidata Q419087
properties
Molar mass	115.03 g mol −1
Physical state	firmly
density	1.81 g cm −3
Melting point	190 ° C (decomposition)
solubility	easily in water (368 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ammonium dihydrogen phosphate (abbreviated MAP from monoammonium phosphate ) is an ammonium salt of phosphoric acid , consisting of the ions NH ₄ ⁺ (ammonium ion) and H ₂ PO ₄ ^- ( dihydrogen phosphate ion ). It forms colorless tetragonal crystals that dissolve well in water.

synthesis

Ammonium can be explained by the neutralization of ammonia with phosphoric win.

${\displaystyle \mathrm {NH_{3}+H_{3}PO_{4}\rightarrow (NH_{4})H_{2}PO_{4}} }$

use

Ammonium dihydrogen phosphate, crystals in reflected light

Ammonium dihydrogen phosphate is mainly used as a fertilizer . It is also suitable for growing crystals . It is also used as an ingredient in fire extinguishing powders.

Individual evidence

1. ↑ ^{a b c d e} Entry on ammonium dihydrogen phosphate in the GESTIS substance database of the IFA , accessed on July 31, 2019 (JavaScript required)
2. ↑ IPNI Nutrient Source Specifics : Monoammonium Phosphate (MAP)