Cobalt(II) nitrate

• Cobalt nitrate
• Cobalt ( II) nitrate

Fixed

• 2.49 g · cm -3 ( anhydrous)
• 1.88 g · cm -3 ( hexahydrate)

55 ° C ( crystalline water)

100-105 ° C ( decomposition)

Well in water (1330 g · l -1)

Risk

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Cobalt nitrate is a salt of nitric acid, made ​​up of the cobalt cation and nitrate anion. The red-brown and hygroscopic salt is typically present as hexahydrate and forms monoclinic crystals which are readily soluble in water, ethanol and other organic solvents. Above 55 ° C the hexahydrate under water discharge goes quickly into the trihydrate. Also known is a monohydrate and crystalline anhydrous salt is pale red and of a powdery consistency.

Use

It is used in the classical inorganic analytical chemistry for the detection of zinc as Rinmans Green ( ZnCo2O4 ) and aluminum as Thenards Blue ( Al2CoO4 ) on the Magnesiarinne.

It is also used for the production of high purity cobalt and is used as a color pigment for ceramics.

Representation

Cobalt (II ) nitrate is prepared by dissolving cobalt, cobalt ( II) oxide or cobalt (II ) carbonate in diluted nitric acid.

Properties

Cobalt (II ) nitrate is crystallized, depending on the crystal water content in various crystal structures whose properties are given in the table below. The hexahydrate passes into the dihydrate at 106 ° C.

Toxicology

Cobalt ( II ) nitrate is carcinogenic and mutagenic and is also suspected to be teratogenic.