Copper(II) nitrate

Copper dinitrate

• 3251-23-8 anhydrous
• Trihydrate 10031-43-3
• Hexahydrate 13478-38-1
• 19004-19-4 hemipentahydrate

Bluish-green, deliquescent crystals, the hydrates are deep blue

Fixed

• 256 ° C anhydrous salt
• 114 ° C trihydrate
• 26 ° C and the hexahydrate

Sublimation > 140 ° C

Well in water ( 1378 g · l-1 at 20 ° C)

Risk

0.1 mg · m-3

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Copper ( II) nitrate is the divalent copper salt of nitric acid.

Production and representation

The salt can be easily obtained by the action of semi- concentrated nitric acid on metallic copper in the laboratory. In the reaction forms gaseous nitric oxide to the copper while the solution changes color with increasing salt concentration similar to the copper chloride from blue to green.

The resulting colorless nitrogen monoxide reacts immediately with oxygen to red-brown nitrogen dioxide on.

Properties

The hydrates are deep blue, the anhydrous substance is blue-green. Solutions of the substance with increasing concentration to exhibit a color change from blue to dark green. The crystals dissolve slowly in the air.

Except as set forth hydrates, copper (II ) nitrate also form a nonahydrate, which is stable only below -20 ° C.

Upon heating of the hydrates is no dehydration, rather arises from about 80 ° C, the basic copper (II ) nitrate, at a temperature above 170 ° C, copper ( II) oxide.

The substance is hazardous to water ( WGK 2).

Use

Copper ( II) nitrate is used as a white ink sheet, the black coloring of copper and burnishing of iron. It is still used for the preparation of copper oxide, corrosion and antifouling agents, flotation and Bohrhilfsmitteln, the dyeing and dye industry as an oxidation agent, as well as for the nitration of organic compounds.