Nomenclature
CAS number: 13478-49-4
Er
2O
12S
3; mol wt 622.71.
Er 53.72%, O 30.83%, S 15.45%.
Er
2(SO
4)
3.
Description and references
Prepared by slow evaporation of a soln of erbium
oxide in sulfuric acid at 20-25°.
Properties
Powder. d 3.678. Hygroscopic; dissociates on heating; dissolves
in water with evolution of heat; forms a basic sulfate on heating
to 850°.Derivative
Octahydrate.
Properties
Pink monoclinic crystals; isomorphic with the
corresponding yttrium, praseodymium and neodymium salts. d 3.205. Soly in water (parts/100
parts): 16 (20°); 6.53 (40°). On heating loses its water of hydration.Status
This monograph has been retired and is no longer subject
to revision or update.