512. Ammonium Citrate, Dibasic

Nomenclature

CAS number: 3012-65-5
2-Hydroxy-1,2,3-propanetricarboxylic acid ammonium salt (1:2); diammonium citrate; citric acid diammonium salt.
C6H14N2O7; mol wt 226.18.
C 31.86%, H 6.24%, N 12.39%, O 49.52%.

Description and references

Prepn: Heldt, Ann. 47, 157 (1843).

Chemical structure

Properties

Granules or crystals; acid reaction. d 1.48. Sol in about 1 part water, slightly in alc. pH of 0.1M soln in H2O = 4.3.

Use

For the determn of phosphate, especially in fertilizers.