551. Ammonium Selenate

Nomenclature

CAS number: 7783-21-3
Selenic acid ammonium salt (1:2).
H8N2O4Se; mol wt 179.03.
H 4.50%, N 15.65%, O 35.75%, Se 44.10%.
(NH4)2SeO4.

Description and references

Prepd by treating a soln of selenic acid with ammonia: Retgers, Z. Phys. Chem. 8, 36 (1891); King, J. Phys. Chem. 41, 797 (1937). Crystal structure: Gatlow, Acta Crystallogr. 15, 419 (1962).

Properties

Monoclinic crystals. d420 2.194. Decomposed by heat. 117 parts dissolve in 100 parts water at 7°, 197 parts in 100 parts at 160°; sol in glacial acetic acid. Insol in alcohol, acetone, ammonia.