Cobalt(II) hydroxide facts for kids

Quick facts for kids Cobalt(II) hydroxide
IUPAC name	Cobalt(II) hydroxide
Other names	Cobaltous hydroxide, cobalt hydroxide, β-cobalt(II) hydroxide
Identifiers
CAS number	21041-93-0
PubChem	10129900
SMILES	[Co+2].[OH-].[OH-]
InChI InChI=1/Co.2H2O/h;2*1H2/q+2;;/p-2
Properties
Molecular formula	Co(OH)2
Molar mass	92.948 g/mol
Appearance	rose-red powder or bluish-green powder
Density	3.597 g/cm3
Melting point	168 °C, 441 K, 334 °F
Solubility in water	3.20 mg/L
Solubility	soluble in acids, ammonia; insoluble in dilute alkalis
Structure
Coordination geometry	rhombohedral
Thermochemistry
Std enthalpy of formation ΔfHo298	-539.7 kJ·mol−1
Standard molar entropy So298	79.0 J·mol−1·K−1
Hazards
EU classification	Template:Hazchem Xn
NFPA 704	0 1 2
R-phrases	R20 R21 R22 R36 R37 R38 R43
S-phrases	S24 S26 S36 S37 S39
Related compounds
Other anions	Cobalt(II) chloride Cobalt(II) bromide Cobalt(II) iodide
Other cations	Iron(II) hydroxide Nickel(II) hydroxide Copper(II) hydroxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Cobalt(II) hydroxide or cobaltous hydroxide is the inorganic compound with the formula CoOH)₂. It is a rose-red powder. An unstable blue form, has also been reported. It is most used as a drying agent for paints, varnishes, and inks, in the preparation of other cobalt compounds, as a catalyst and in the manufacture of battery electrodes.

Related pages

• Cobalt(II) sulfate
• Cobalt(III) oxide
• Cobalt

Images for kids

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  Cobalt hydroxide nanotubes. Scale bars: (a,b) 500 nm, inset 200  nm; (c,e) 50 nm; (d) 100  nm.