543. Ammonium Phosphate, Monobasic

Nomenclature

CAS number: 7722-76-1
Phosphoric acid ammonium salt (1:1); ammonium biphosphate; ammonium dihydrogen phosphate; primary ammonium phosphate.
H6NO4P; mol wt 115.03.
H 5.26%, N 12.18%, O 55.64%, P 26.93%.
(NH4)H2PO4.

Description and references

Prepn: Gmelins, Ammonium (8th ed.) 23, pp 426-429 (1936).

Properties

Odorless crystals or white, cryst powder; stable in air. mp 193.3°. bp 376.1° (dec). d 1.80. One gram dissolves in about 2.5 ml water; slightly sol in alcohol; practically insol in acetone. pH of 0.2 molar aq soln 4.2.

Use

In buffer solutions. As baking powder with sodium bicarbonate; in fermentations (yeast cultures, etc.); fireproofing of paper, wood, fiberboard, etc.