| Uses | Cobalt nitrate is used in the decoration of porcelain and stones; in the manufacture of invisible inks and cobalt pigments; in hair dyes; in animal feeds; as an additive to soils; in catalysts preparation; and in vitamin supplements.
|
| Chemical Properties | Red crystals. Deliquescent in moist air.
Soluble
in most organic solvents. |
| Physical properties | The hexahydrate is red monoclinic crystal; deliquescent in moist air; density 1.87 g/cm3; decomposes at 55°C, losing three molecules of water; decomposes to green cobalt(II) oxide on further heating at 74°C; very soluble in water (134 g/100mL at 0°C); also soluble in alcohols and acetone. The anhydrous salt is pale red powder; density 2.49 g/cm3; decomposes around 100°C; soluble in water. |
| Uses | Sympathetic inks, cobalt pigments, catalysts,
additive to soils and animal feeds, vitamin preparations, hair dyes, porcelain decoration. |
| Uses | Cobalt(II) Dinitrate is mainly reduced to metallic high purity cobalt used for catalysis reactions. |
| Definition | ChEBI: A cobalt salt in which the cobalt metal is in the +2 oxidation state and the counter-anion is nitrate. |
| Preparation | Cobalt(II) nitrate is prepared by treating the metal, or its oxide, hydroxide or carbonate with dilute nitric acid. The solution on evaporation yields red crystals of hexahydrate:
Co + 2HNO3 → Co(NO3)2 + H2
Co(OH)2+ 2HNO3 → Co(NO3)2 + 2H2O
CoCO3+ 2HNO3→ Co(NO3)2 + CO2 + H2O. |
| General Description | Odorless red solid. Sinks and mixes with water. |
| Air & Water Reactions | Water soluble. |
| Reactivity Profile | Mixtures of metal/nonmetal nitrates with alkyl esters may explode, owing to the formation of alkyl nitrates; mixtures a nitrate with phosphorus, tin (II) chloride or other reducing agents may react explosively [Bretherick, 1979 p. 108-109]. |
| Hazard | Oxidizing agent, dangerous fire risk in contact with organic materials. |
| Health Hazard | Inhalation causes shortness of breath and coughing; permanent disability may occur. Ingestion causes pain and vomiting. Contact with eyes or skin causes irritation. |
| Flammability and Explosibility | Notclassified |
