Nomenclature
CAS number: 21041-93-0
CoH
2O
2; mol wt 92.95.
Co 63.40%, H 2.17%, O 34.43%.
Co(OH)
2.
Description and references
Prepd from a solution of a cobaltous salt and
an alkali hydroxide: Glemser in Handbook
of Preparative Inorganic Chemistry vol. 2, G.
Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1521; Weiser,
Milligan, J. Phys. Chem. 36, 722 (1932). Review: de Bie, Doyen, Cobalt 15, 3-13; 16, 3-15 (1962).
Properties
Blue-green or rose-red powder or microscopic rhombohedral
crystals; red form is the more stable of the two. d415 3.597.
Easily oxidized by air or weak oxidizing agents to Co(OH)3. Amphoteric. Loses water on heating, forming CoO at 168° in vacuo. Very slightly sol in water; readily sol in acids;
practically insol in dil alkalies; sol in ammonia.Use
Manuf of Co compds; drier for paints; in enhancing
drying properties of lithographic printing inks; in storage battery
electrode impregnating solns.