Nickel(II) hydroxide

Nickeldihydroxid

Apple green powder

Fixed

4.15 g · cm -3

285 ° C (decomposition to nickel (II ) oxide )

Practically insoluble in water

Risk

1515 mg · kg -1 ( LD50, rat, oral)

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Nickel ( II) hydroxide is a chemical compound of the metal, nickel, which belongs to the group of the hydroxides.

Occurrence

Of course, nickel (II ) hydroxide occurs in the form of the very rare mineral Theophrastit.

Production and representation

Nickel ( II) hydroxide is formed in the detection of nickel ions from solutions of nickel salt with sodium hydroxide as a precipitate with clear green color:

In excess of ammonia, the nickel (II ) hydroxide under blue staining resolves as hexammine complex on again:

Chemical Properties

By the addition of strong oxidizing agents such as chlorine or bromine, but not hydrogen peroxide, is nickel (II) hydroxide in the black nickel ( IV) oxide on:

Formed by the electrolytic oxidation of nickel ( II) hydroxide, nickel ( III) oxide and nickel (III) oxyhydroxide. This process is reversible for the nickel -cadmium storage battery and nickel-iron accumulator is important.

Exists with 3Ni (OH) 2 2H2O, a green, and stable in the dry state hydrate.

Use

Nickel ( II) hydroxide is used for plating, as a main component for plates of alkaline batteries (see nickel-iron batteries, nickel - cadmium battery, nickel - hydrogen storage battery and nickel -metal hydride storage battery ) and is used for the manufacture of nickel catalysts.

Safety

How many nickel compounds is classified as carcinogenic ( category 3) nickel (II ) hydroxide. In addition, nickel (II ) hydroxide has a sensitizing effect.