Chemical elements
  Nickel
    History
    Occurrence
    Isotopes
    Energy
    Production
    Preparation
    Application
    Catalyst
    Physical Properties
    Compounds
      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
      Nickelamide
      Nitro-nickel
      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 Iodate, Ni(IO3)2






Nickel Iodate, Ni(IO3)2, discovered by Rammelsberg, is interesting on account of its hydrates. The anhydrous salt is obtained as microscopic yellow needles by heating to 100° C. a mixture of nickel nitrate, iodic acid, and nitric acid. It is but slightly soluble in water, the solubility decreasing with rise of temperature.

Temperature ° C.30507590
Grams Ni(IO3)2 in 100 grams solution.1.1351.071.020.988


A monohydrate, Ni(IO3)2.H2O, was obtained by Rammelsberg as a bright green powder by concentrating solutions of nickel sulphate and sodium iodate or a solution of nickel hydroxide in aqueous hydriodic acid. Clarke was unable to find this salt.

The dihydrate, Ni(IO3)2.2H2O, exists in two isomeric forms known respectively as the α and β varieties.

The α-salt is obtained by allowing a mixture of nickel nitrate and iodic acid to stand for several days at 25° to 30° C., when a crystalline mass is formed. It is but slightly soluble in water.

Temperature ° C.0183050 (transition temperature)
Grams Ni(IO3)2 in 100 grams solution.0.530.680.861.78


At 50° C. in the presence of water the α-salt is converted into the β-salt, which crystallises in small prisms which are even less soluble in water. Thus:

Temperature ° C818507580
Grams Ni(IO3)2 in 100 grams solution.0.520.550.811.031.12


The trihydrate, Ni(IO3)2.3H2O, was first described by Ditte, who evaporated slowly a mixed solution of nickel nitrate and an alkaline iodate. The salt crystallises out in green transparent prisms.

The tetrahydrate, Ni(IO3)2.4H2O, separates out as green hexagonal prisms when a solution of nickel nitrate and sodium iodate is concentrated between 0° and 10° C. The solubility of the salt is as follows:

Temperature ° C01830
Grams Ni(IO3)2 in 100 grams solution0.731.011.41


The hexahydrate, Ni(IO3)2.6H2O, was prepared by Clarke by dissolving nickel carbonate in aqueous iodic acid and allowing to slowly evaporate. The salt yields small green crystals of density 3.70 at 22° C.

Two Periodates of nickel have been described, namely, the meso salt, Ni3(IO5)2, and the diperiodate, Ni2I2O9. The former is obtained as a greenish yellow amorphous salt by the action of nickel sulphate on a solution of Na2H3IO6 when, on boiling, the salt separates out as a flocculent precipitate. Ni2I2O9 occurs as a black crystalline salt obtained by drying at 100° C. the bluish green gelatinous precipitate resulting from mixing solutions of nickel sulphate and K4I2O9.


© Copyright 2008-2012 by atomistry.com