Cobalt(II) nitrate

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Cobalt(II) nitrate
Cobalt(II) nitrate hydrate crystals by vano.jpg
Some nice cobalt(II) nitrate crystals
Names
IUPAC name
Cobalt(II) nitrate
Other names
Cobalt dinitrate
Cobaltous nitrate
Properties
Co(NO3)2 (anhydrous)
Co(NO3)2·6H2O (hexahydrate)
Molar mass 182.943 g/mol (anhydrous)
291.03 g/mol (hexahydrate)
Appearance Pale red powder (anhydrous)
Red crystalline solid (hexahydrate)
Odor Odorless
Density 2.49 g/cm3 (anhydrous)
1.87 g/cm3 (hexahydrate)
Melting point anhydrous
100 °C (212 °F; 373 K) (decomposes)
hexahydrate
55 °C (131 °F; 328 K) (hexahydrate) (decomposes)
Boiling point anhydrous
100-105 °C (212-221 °F; 373-378 K) (decomposes)
hexahydrate
74 °C (165 °F; 347 K) (decomposes)
anhydrous
84.03 g/100 ml (0 °C)
334.9 g/100 ml (90 °C)
hexahydrate
66.96 g/100 ml (20 °C)
Solubility Soluble in acetone, DMSO, ethanol, methanol
Insoluble in hydrocarbons
Vapor pressure ~0 mmHg
Thermochemistry
-420.5 kJ/mol
Hazards
Safety data sheet Sigma-Aldrich (hexahydrate)
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
434 mg/kg (rat, oral) (anhydrous)
691 mg/kg (rat, oral) (hexahydrate)
Related compounds
Related compounds
Cobalt(II) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Cobalt nitrate is the inorganic compound with the general formula Co(NO3)2·xH2O. The most common form is the hexahydrate Co(NO3)2·6H2O.

Properties

Chemical

Addition of an alkali hydroxide to an aq. solution of cobalt nitrate yields cobalt hydroxide:

Co(NO3)2 + MOH → Co(OH)2 + MNO3

Physical

Cobalt nitrate is a reddish crystalline solid, soluble in water.

Availability

Cobalt nitrate is sold by chemical suppliers.

Preparation

Cobalt nitrate hexahydrate can be prepared by treating metallic cobalt or one of its oxides, hydroxides, or carbonate with nitric acid:

Co + 4 HNO3 + 4 H2O → Co(NO3)2·6H2O + 2 NO2
CoO + 2 HNO3 + 5 H2O → Co(NO3)2·6H2O
CoCO3 + 2 HNO3 + 5 H2O → Co(NO3)2·6H2O + CO2

Projects

  • Grow nice red crystals
  • Make coordination complexes
  • Compound collecting

Handling

Safety

Cobalt nitrate, like all cobalt compounds, is harmful and a known allergen.

Storage

In closed containers.

Disposal

Cobalt nitrate should be converted to an insoluble form, before being taken to disposal centers.

References

Relevant Sciencemadness threads