Chemical elements
    Physical Properties
      Nickel Fluoride
      Nickel Dichloride
      Double Nickel Chlorides
      Nickel Dibromide
      Nickel Di-iodide
      Nickel Chlorate
      Nickel Perchlorate
      Nickel Bromate
      Nickel Iodate
      Tri-nickel Suboxide
      Nickel Suboxide
      Nickel Monoxide
      Nickel Dihydroxide
      Nickelo-nickelic Oxide
      Nickel Dioxide
      Nickel Subsulphide
      Nickel Monosulphide
      Nickel Sesquisulphide
      Tri-nickel Tetrasulphide
      Nickel Disulphide
      Nickel Tetrasulphide
      Nickel Sulphite
      Nickel Thiosulphate
      Nickel Dithionate
      Nickel Sulphate
      Nickel Subselenide
      Nickel Selenide
      Nickel Sesquiselenide
      Nickel Selenite
      Nickel Sesquitelluride
      Nickel Tellurite
      Nickel Chromate
      Nickel Dichromate
      Double Nickel Chromates
      Nickel Molybdate
      Nickel Nitride
      Nickel Azoimide
      Nickel Nitrite
      Nickel Nitrate
      Di-nickel Phosphide
      Nickel Sesquiphosphide
      Nickel Diphosphide
      Nickel Triphosphide
      Nickel Hypophosphite
      Nickel Phosphite
      Nickel Metaphosphate
      Nickel Orthophosphate
      Nickel Pyrophosphate
      Nickel Thio-orthophosphate
      Nickel Thiopyrophosphite
      Nickel Thiopyrophosphate
      Tri-nickel Diarsenide
      Nickel Arsenide
      Nickel Diarsenide
      Nickel Arsenite
      Nickel Orthoarsenate
      Nickel Antimonide
      Nickel Antimonate
      Nickel Thioantimonite
      Nickel Vanadate
      Nickel Carbide
      Nickel Tetracarbonyl
      Nickel Carbonate
      Nickel Monocyanide
      Nickel Cyanide
      Nickel Thiocyanate
      Nickel Thiocarbonate Hexammoniate
      Nickel Subsilicide
      Nickel Orthosilicate
      Nickel Monoboride
      Nickel Borates
    PDB 1a5n-1g2a
    PDB 1g3v-1mn0
    PDB 1mro-1s9b
    PDB 1scr-1xmk
    PDB 1xu1-2cg5
    PDB 2cqz-2jih
    PDB 2jk8-2v4b
    PDB 2vbq-3c2q
    PDB 3c6c-3h85
    PDB 3hdp-3kvb
    PDB 3l1m-3o00
    PDB 3o01-4ubp
    PDB 8icl-9ant

Nickel Dihydroxide, Ni(OH)2

Nickelous Hydroxide, Nickel Dihydroxide, Ni(OH)2, is obtained as an apple-green precipitate upon warming aqueous alkali hydroxide with a solution of a nickel salt. The precipitate is not perfectly pure, but contains traces of alkali and of the original acid. It is very slightly soluble in water, but readily soluble in ammonium hydroxide, yielding a deep blue solution from which the nickel hydroxide is deposited in crystalline form on boiling.

Nickel hydroxide may also be obtained in the crystalline form by allowing a solution of sodium chloride to stand over mercury with a nickel wire connecting both liquids. The reaction is extremely slow, however.

Nickel hydroxide is formed when a fifth normal solution of nickel nitrate is exposed to hydrogen under a pressure of 100 atmospheres, and when a similar concentration of nickel acetate is exposed to hydrogen under the same pressure at 120° C.

Nickel hydroxide dissolves in ordinary distilled water to the extent of 12.7 mgs. of Ni(OH)2 per litre at 20° C. It is soluble in acids, yielding nickel salts; when heated, water is evolved, leaving a residue of nickel monoxide. It is quite insoluble even in concentrated solutions of potassium or sodium hydroxide, and is less readily oxidised in air than the corresponding cobalt derivative. Its solution in ammonia is a solvent for silk, but not for cotton.

Nickel hydroxide has been obtained in colloidal form by treating a solution of nickel sulphate with one of sodium protalbinate or lysalbinate, and dissolving the precipitate in dilute sodium hydroxide.

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