Nomenclature
CAS number: 7783-28-0
Phosphoric acid ammonium salt (1:2); secondary ammonium phosphate; diammonium hydrogen phosphate; Fyrex.
H
9N
2O
4P; mol wt 132.06.
H 6.87%, N 21.21%, O 48.46%, P 23.45%.
(NH
4)
2HPO
4.
Description and references
The grade used medicinally is 98-99% pure.
Prepn: Gmelins, Ammonium (8th
ed.) 23, pp 422-426 (1936).
Properties
Odorless crystals or cryst powder; saline, cooling
taste; gradually loses about 8% NH3 on exposure to air.
One gram dissolves in 1.7 ml water, 0.5 ml boil water; practically
insol in alcohol, acetone. pH about 8. Keep
well closed.Use
Fireproofing textiles, paper, wood, and vegetable
fibers; impregnating lamp wicks; preventing afterglow in matches;
flux for soldering tin, copper, brass, and zinc; purifying sugar;
in yeast cultures; in dentifrices; in corrosion inhibitors; in fertilizers;
in buffers.