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 Perchlorate, Ni(ClO4)2

Nickel Perchlorate, Ni(ClO4)2, may be obtained by dissolving nickel hydroxide or carbonate in a solution of perchloric acid, expelling the excess of acid at 110° C., and concentrating to crystallisation. The salt separates out in long, green needles, soluble in water, alcohol, and acetone, but insoluble in chloroform. The salt may be dried by warming in a current of dry air or by prolonged exposure over sulphuric acid. It then has the formula Ni(ClO4)2.5H2O. The crystals melt at 149° C., but already at 103° C. slight decomposition sets in with loss of perchloric acid and production of basic salt. The solution in water gradually undergoes hydrolytic dissociation, nickel hydroxide being precipitated.

If a piece of blotting or filter paper is moistened with a solution of nickel perchlorate and introduced into the tip of a Bunsen flame, a series of small detonations ensues.

At -21.3° C. the nonahydrate, Ni(ClO4)2.9H2O, is formed.

Two other hydrates, namely, the hexahydrate, Ni(ClO4)2.6H2O, and the tetrahydrate, Ni(ClO4)2.4H2O, have been described, as also the hexammoniate, Ni(ClO4)2.6NH3.

The solubility of nickel perchlorate in water is as follows:

Temperature °C,-30.7-21.307.5182645
Grams Ni(ClO4)2 in 100 grams of solution.20.50521.0623.5524.3225.0625.5527.02
Density of solution.1.57261.57551.57601.58411.5936

The anhydrous salt apparently cannot exist since the hydrated salt decomposes on warming before all the water has been expelled.

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