Chemical elements
    Physical Properties
    Chemical Properties
      Strontium Hydride
      Strontium Fluoride
      Strontium Chloride
      Strontium Perchloride
      Strontium Bromide
      Strontium Perbromide
      Strontium Iodide
      Strontium Periodides
      Mixed Halides
      Strontium Oxychloride
      Strontium Hypochlorite
      Strontium Chlorite
      Strontium Chlorate
      Strontium Perchlorate
      Strontium Oxybromide
      Strontium Bromate
      Strontium Oxyiodide
      Strontium Iodate
      Strontium Periodate
      Strontium Manganite
      Strontium Manganate
      Strontium Permanganate
      Strontium Suboxide
      Strontium Oxide
      Strontium Hydroxide
      Strontium Peroxide
      Strontium Diperoxyhydrate
      Strontium Hydride
      Strontium Hydrosulphide
      Strontium Polysulphides
      Strontium Oxysulphide
      Strontium Thiosulphate
      Strontium Hyposulphite
      Strontium Sulphite
      Strontium Dithionate
      Strontium Tetrathionate
      Strontium Sulphate
      Acid Strontium Sulphate
      Strontium Pyrosulphate
      Strontium Selenide
      Strontium Selenite
      Strontium Selenate
      Strontium Telluride
      Strontium Tellurite
      Strontium Tellurate
      Strontium Chromate
      Strontium Dichromate
      Strontium Trichromate
      Strontium Chlorochromate
      Strontium Molybdate
      Complex Strontium Molybdates
      Strontium Tungstate
      Strontium Uranate
      Strontium Nitride
      Strontium Azide
      Strontium Ammonium
      Strontium Hexammoniate
      Strontium Amide
      Strontium Imide
      Strontium Imidosulphonate
      Strontium Hyponitrite
      Strontium Nitrohydroxylaminate
      Strontium Nitrite
      Strontium Nitrate
      Strontium Phosphide
      Strontium Dihydrohypophosphite
      Strontium Hydrophosphite
      Strontium Dihydrophosphite
      Strontium Orthophosphates
      Strontium Pyrophosphate
      Strontium Metaphosphate
      Basic Strontium Phosphate
      Strontium Arsenide
      Strontium Orthoarsenites
      Strontium Pyroarsenite
      Strontium Metarsenite
      Strontium Orthoarsenates
      Strontium Pyroarsenate
      Strontium Thioarsenites
      Strontium Thio-oxyarsenates
      Strontium Thioantimonite
      Strontium Antimonate
      Strontium Orthovanadate
      Strontium Metavanadate
      Strontium Pervanadate
      Strontium Carbide
      Strontium Carbonyl
      Strontium Formate
      Strontium Acetate
      Strontium Oxalate
      Strontium Carbonate
      Strontium Trithiocarbonate
      Strontium Perthiocarbonate
      Strontium Cyanide
      Strontium Cyanamide
      Strontium Thiocyanate
      Strontium Silicide
      Strontium Silicate
      Strontium Fluosilicate
      Strontium Stannate
      Strontium Orthoplumbate
      Strontium Titanate
      Strontium Zirconate
      Strontium Boride
      Strontium Borates
      Strontium Aluminates
      Strontium Ferrate
    PDB 1cs7-2spt
    PDB 2woh-4ds7

Strontium Carbonate, SrCO3

Strontium Carbonate, SrCO3, occurs in nature as the mineral strontianite, of density 3.4 – 3.7, and isomorphous with aragonite. It may be formed by precipitation from strontium chloride solution by ammonium carbonate, or by the action of carbon dioxide on heated strontium hydroxide, or strontium oxide at red heat.

For the technical production several methods may be employed: -
  1. Fusion of celestine with sodium carbonate.
  2. Boiling celestine with a concentrated solution of ammonium carbonate.
  3. Action of a mixture of calcium chloride, carbon, and metallic iron on celestine at red heat. The sulphate is thus converted into the carbonate by ammonium carbonate, or by milk of lime and carbon dioxide.
  4. Boiling with magnesium chloride a solution of strontium hydrosulphide through which carbon dioxide is passing.

The precipitated carbonate can be transformed into strontianite by crystallisation from solution in fused alkali chlorides.

The specific heat of strontianite is 0.1445, and of the precipitated carbonate 0.14483. The density of the precipitated carbonate is 3.55 – 3.62.

Strontium carbonate is less readily decomposed by heat than calcium carbonate. Its dissociation pressure reaches 1 atmosphere of carbon dioxide at about 1155° C., but the rate of decomposition only becomes rapid when a temperature of 1255° C. is reached.

The heat of formation of crystallised strontium carbonate from strontium oxide and carbon dioxide is 57.3 Cal.

Strontium carbonate is dimorphic, the transition point to the α-form being 920°-929° C. α-Strontium carbonate belongs to the hexagonal system. The melting-point in an atmosphere of carbon dioxide under pressure is 1497° C.

Strontium carbonate is only very slightly soluble in water, the solubility at 18° C. being 11 mgm. per litre, and the solubility product [Sr2+]×[CO32-] = 1.567×10-9. This value was deduced from experiments carried out under a pressure of carbon dioxide varying from 0.05 – 1.1 atmosphere. A saturated solution of strontium carbonate under ordinary atmospheric conditions reacts alkaline, owing to hydrolysis. The solubility is increased by the presence of carbon dioxide in the water, through the formation of the acid carbonate in solution. It is also increased by the presence of ammonium chloride or nitrate.

A colloidal solution of strontium carbonate may be formed by passing carbon dioxide through a methyl alcoholic solution of strontium oxide. No separation of the gel takes place.

By the addition of a solution of strontium chloride to a saturated solution of potassium carbonate a transparent jelly-like mass, consisting of the double salt, SrCO3.K2CO3, is obtained, and this, on stirring, becomes opaque and finally granular.

The crystalline double salts, SrCO3.K2CO3 and SrCO3.Na2CO3, may be prepared by fusion.

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