Chemical elements
    Physical Properties
    Chemical Properties
      Cobaltous Fluoride
      Hydrated Cobaltous Fluoride
      Cobaltic Fluoride
      Cobaltous Chloride
      Cobaltic Chloride
      Cobaltous Bromide
      Cobaltous Iodide
      Cobalt Oxy-fluoride
      Cobalt Oxy-chloride
      Cobalt Chlorate
      Cobalt Perchlorate
      Cobalt Bromate
      Cobalt Iodate
      Cobalt Monoxide
      Cobaltous Hydroxide
      Tri-cobalt Tetroxide
      Cobalt Sesquioxide
      Hydrated Cobaltic Oxide
      Cobalt Dioxide
      Cobalt Monosulphide
      Tricobalt Tetrasulphide
      Cobalt Sesquisulphide
      Cobalt Disulphide
      Cobalt Polysulphides
      Cobaltous Sulphite
      Cobaltic Sulphite
      Cobalt Thiosulphate
      Cobalt Dithionate
      Cobalt Sulphate
      Ammonium Cobalt Sulphate
      Potassium Cobalt Sulphate
      Cobaltic Sulphate
      Ammonium Cobalt Alum
      Potassium Cobalt Alum
      Cobalt Subselenide
      Cobalt Selenide
      Tricobalt Tetraselenide
      Cobalt Sesquiselenide
      Cobalt Diselenide
      Cobalt Selenite
      Cobalt Diselenite
      Cobalt Triselenite
      Cobaltous Selenate
      Cobaltic Selenate
      Cobalt Sesquitelluride
      Cobalt Tellurite
      Cobalt Chromate
      Cobalt Dichromate
      Double Chromates
      Cobalt Molybdate
      Cobalt Nitride
      Cobalt Azoimide
      Potassium Cobaltous Nitrite
      Potassium Cobalti-nitrite
      Sodium Cobalti-nitrite
      Sodium Potassium Cobalti-nitrite
      Ammonium Cobalti-nitrite
      Barium Cobalti-nitrite
      Red Sodium Cobalti-nitrite
      Red Barium Cobalti-nitrite
      Red Strontium Cobalti-nitrite
      Zinc Cobalti-tri-nitrite
      Silver Cobalti-tri-nitrite
      Cobaltous Nitrate
      Cobaltic Nitrate
      Cobalt Subphosphide
      Cobalt Sesquiphosphide
      Tri-cobalt Diphosphide
      Tetra-cobalt Triphosphide
      Cobalt Hypophosphite
      Cobalt Phosphite
      Cobalt Metaphosphate
      Tri-cobalt Di-arsenide
      Cobalt Monarsenide
      Cobalt Tri-arsenide
      Cobalt Arsenites
      Cobalt Arsenates
      Cobalt Antimonide
      Cobalt Di-antimonide
      Cobalt Antimonate
      Cobalt Thio-antimonite
      Cobalt Carbide
      Cobalt Tetra-carbonyl
      Cobaltous Carbonate
      Basic Cobaltous Carbonates
      Cobaltic Carbonate
      Cobaltous Cyanide
      Potassium Cobalto-cyanide
      Nickel Cobalto-cyanide
      Cobaltous Cobalto-cyanide
      Zinc Cobalto-cyanide
      Cobalti-cyanic Acid
      Ammonium Cobalti-cyanide
      Barium Cobalti-cyanide
      Potassium Cobalti-cyanide
      Cobalt Cobalti-cyanide
      Cupric Cobalti-cyanide
      Ferrous Cobalti-cyanide
      Nickel Cobalti-cyanide
      Silver Cobalti-cyanide
      Lead Cobalti-cyanide
      Sodium Cobalti-cyanide
      Cobalt Thiocyanate
      Cobalt Subsilicide
      Cobalt Monosilicide
      Cobalt Disilicide
      Cobalt Orthosilicate
      Cobalt Fluosilicate
    PDB 1a0c-1epy
    PDB 1et4-1k7y
    PDB 1k98-1r6x
    PDB 1r8k-1v9b
    PDB 1vl3-212d
    PDB 222d-2eff
    PDB 2ehd-2j3z
    PDB 2j4j-2r1p
    PDB 2r2s-331d
    PDB 362d-3fqw
    PDB 3ft6-3igy
    PDB 3igz-3o0n
    PDB 3o0o-4req
    PDB 4xim-9icb

Cobaltous Nitrate, Co(NO3)2

Cobaltous Nitrate, Co(NO3)2, may be obtained in the anhydrous condition by the action of nitric anhydride, or a solution of this in nitric acid upon the hydrated salt.

It is a slightly pink powder which decomposes at 100° to 105° C., evolving nitrous fumes.

A solution of cobaltous nitrate in water is readily prepared by dissolving the oxides or carbonate in dilute nitric acid. Slow evaporation yields red, monoclinic prisms of the hexahydrate, Co(NO3)2.6H2O, of density 1.83. The crystals are very slightly deliquescent in moist air; over concentrated sulphuric acid they effloresce. They melt at 56° C. to a red liquid which, at higher temperatures, thickens, becoming green, and decomposes evolving brown fumes leaving a residue of oxide. The solubility of the hexahydrate in water is as follows:

Temperature ° C-21-10-40184156
Grams Co(NO3)2 per 100 grams solution41.5543.6944.8545.6649.7355.9662.88

A solution of cobaltous nitrate saturated at 18° C. has a density of 1.575. Between.-21° and 41° C. the composition of the saturated solution at any temperature is given by the expression:

Co(NO3)2 + (12.183 - 0.10177t)H2O.

There is no evidence of the existence of a tetrahydrate. When the hexahydrate is kept at 20° to 60° C. in vacuo, or when melted and kept at 70° to 74° C., three molecules of water are lost, and the trihydrate, Co(NO3)2.3H2O, crystallises out in large, rhombic prisms. These melt at 91° C., but do not lose any more water without decomposition. The solubilities of the trihydrate in water at various temperatures are as follow:

Temperature ° C5562708491
Grams Co(NO3)2 per 100 grams solution61.7462.8864.8968.8477.21

There is a break in the solubility curve of the salt at.-22° C. which is attributed by Funk to the formation of a nonahydrate at temperatures below this point. This hydrate has not been isolated, although the corresponding nickel salt has been prepared and analyzed. Its solubility in water is as follows:

Temperature ° C.-26-23.5-20.5
Grams Co(NO3)2 per 100 grams solution39.4540.4042.77

Addition of ammonia in excess to a solution of cobaltous nitrate in the absence of air results in the deposition of rose-coloured crystals of the hexammoniate, Co(NO3)2.6NH3.3H2O.

A double nitrate of cobalt and bismuth, 3Co(NO3)2.2Bi(NO3)3.24H2O, has been prepared as red crystals, melting at 58° C., and of density 2.48 at 16° C.

Basic nitrates have been described.

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