Diammonium hydrogen phosphate

Structural formula
General
Surname	Diammonium hydrogen phosphate
other names	Ammonium hydrogen phosphate; di-ammonium phosphate; Ammonium phosphate dibasic; Fermentation salt;
Molecular formula	(NH 4 ) 2 HPO 4
Brief description	white solid
External identifiers / databases
EC number	231-987-8
ECHA InfoCard	100,029,079
PubChem	24540
Wikidata	Q418889
properties
Molar mass	132.05 g mol −1
Physical state	firmly
density	1.62 g cm −3 (at 20 ° C)
Melting point	155 ° C (decomposition)
solubility	good in water (132 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases
Toxicological data	6500 mg kg −1 ( LD 50 , rat , oral )
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Diammonium hydrogen phosphate is an ammonium salt of phosphoric acid . In agriculture, the terms diammonium phosphate , diammonium phosphate , DAP and 18-46-0 (18% N , 46% P ₂ O ₅ , 0% K ₂ O ) are common. It has the formula (NH ₄ ) ₂ HPO ₄ and belongs to the hydrogen phosphate class .

properties

Diammonium hydrogen phosphate is readily soluble in water. Its aqueous solutions are weakly basic with a pH value of: 7.6–8.2 (100 g / l H ₂ O).

presentation

Diammonium hydrogen phosphate can be produced from ammonia and phosphoric acid :

{\ displaystyle \ mathrm {2 \; NH_ {3} + H_ {3} PO_ {4} \ rightarrow (NH_ {4}) _ {2} HPO_ {4}}.}

use

It is used mainly as fertilizer used in addition to the impregnation of matches and as flame retardants for wood (for example for forest fire fighting.), As a nitrogen - and phosphorous source in the Hefezüchtung (commercially available as Hefenährsalz), as a flux during soldering, As a catalyst in the production of aminoplasts , for the chrome coloring of wool and is a component of special glasses and types of enamel . In analytics, it is used in the separation process to detect magnesium ions .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g data sheet Ammonium phosphate dibasic from Sigma-Aldrich , accessed on February 12, 2019 ( PDF ).
^ KA Barbarick, DG Westfall: Fertilizer Cost Calculations

[Sigma-1] ↑ ^a ^b ^c ^d ^e ^f ^g data sheet Ammonium phosphate dibasic from Sigma-Aldrich , accessed on February 12, 2019 ( PDF ).

[2] KA Barbarick, DG Westfall: Fertilizer Cost Calculations