Nomenclature
CAS number: 814-89-1
C
2CoO
4; mol wt 146.95.
C 16.35%, Co 40.10%, O 43.55%.
CoC
2O
4.
Description and references
Prepn: Robin, Bull.
Soc. Chim. Fr. 1953, 1078; Gmelins, Cobalt (8th ed.) 58 (part A) p 355
(1932) and supplement, pp 704-706 (1961). Review: de
Bie, Doyen, Cobalt 15, 3-13; 16, 3-15 (1962).
Properties
d425 3.021. Readily absorbs moisture from air
to form hydrates.Derivative
Dihydrate.
Properties
Light pink microcryst powder or needles. Almost
insol in water; slightly sol in acids; almost insol in aq oxalic acid;
freely sol in aq ammonia. Dec on heating with aq KOH or Na2CO3 soln.Derivative
Tetrahydrate.
Properties
Yellowish-pink amorphous powder. Effloresces
on exposure to air. Loses water on heating to 100° giving the dihydrate.
Very slightly sol in water; slightly sol in acids; readily sol in
aq ammonia.Use
Prepn of Co catalysts, Co metal powder for powder-metallurgical
applications; stabilizer for HCN; temperature indicator.