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 Dichloride, NiCl2

Nickelous Chloride or Nickel Dichloride, NiCl2, is prepared in the anhydrous condition by heating the finely divided metal in dry chlorine. It may also be obtained by evaporating to dryness a solution of nickel oxide (or carbonate) in aqueous hydrogen chloride, and heating gently the solid residue in the absence of air, most advantageously in dry hydrogen chloride gas. The salt sublimes as golden scales of density 2.56.

When heated in air nickel chloride decomposes, evolving chlorine and leaving the oxide. At dull red heat in dry hydrogen a volatile compound, possibly NiClH, is produced. Upon exposure to air the scales absorb moisture and then become easily soluble in water. From such solutions the hexahydrated salt, NiCl2.6H2O, is obtained upon evaporation. When exposed to ammonia the anhydrous salt swells to a white powder of formula NiCl2.6NH3, readily soluble in water. A substance of similar empirical composition may be obtained as blue octahedra by dissolving nickel chloride in concentrated ammonia, and either allowing to cool or by addition of alcohol. It evolves ammonia upon exposure to air, and particularly in vacuo.

Nickel chloride is also soluble in alcohol.

Several hydrates are known. The monohydrate, NiCl2.H2O, is obtained as a yellowish green salt on adding hydrochloric acid to a solution of the chloride in water. The dihydrate, NiCl2.2H2O, results upon keeping the hexahydrate in a desiccator. It is yellow in colour.

The usual form of the salt is the hexahydrate, NiCl2.6H2O, which may most easily be obtained by dissolving one of the oxides or the carbonate of nickel in hydrochloric acid and crystallising out. It yields monoclinic prisms isomorphous with the corresponding cobalt salt. It is deliquescent, and soluble both in water and alcohol.

The solubility of nickel chloride in water is as follows:

Temperature ° С010204060100
Grams NiCl2 per 100 grams solution.35.037.339.142.345.146.7

When exposed to hydrogen under a pressure of 100 atmospheres at 250° C., a fifth normal solution of nickel chloride deposits a little metallic nickel.

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