Cobalt(II) nitrate
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| 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 | |
| Std enthalpy of
formation (ΔfH |
-420.5 kJ/mol |
| Hazards | |
| Safety data sheet | Sigma-Aldrich (hexahydrate) |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
| LD50 (Median dose)
|
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.
Contents
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.
