496. Ammonium Benzoate

Nomenclature

CAS number: 1863-63-4
Benzoic acid ammonium salt (1:1).
C7H9NO2; mol wt 139.15.
C 60.42%, H 6.52%, N 10.07%, O 23.00%.

Description and references

It is about 99% pure. Manuf from benzoic acid and NH3: J. A. Spina, US 1704636 (1929 to Hooker Electrochem.). Analytical applications in metal cation separations: I. M. Kolthoff et al., J. Am. Chem. Soc. 56, 812 (1934); A. Jewsbury, G. H. Osborn, Anal. Chim. Acta 3, 642 (1949). Structural studies: I. A. Oxton et al., Can. J. Chem. 55, 3831 (1977).

Chemical structure

Properties

Lamellar crystals or crystalline powder; odorless or faint benzoic acid odor; gradually loses NH3 on exposure to air. d 1.26. mp 198°. One gram dissolves in 4.7 ml water, 1.2 ml boiling water, 36 ml alcohol, 8 ml boiling alcohol, 8 ml glycerol. The aq soln is slightly acid. Keep well closed. Incompat. Ferric salts, acids, alkali hydroxides or carbonates.

Use

To preserve glue and latex. In determn of benzoate stabilizers in feeds.