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 Sulphate, SrSO4

Strontium Sulphate, SrSO4, occurs naturally as the mineral celestine, or associated with barium as barytocelestine. Celestine forms rhombic crystals, sometimes of a blue colour, hence its name. Certain waters contain strontium sulphate in solution. It may be obtained as a microcrystalline precipitate by the action of sulphuric acid on a strontium salt, or in larger crystals by the fusion of an excess of strontium chloride with potassium sulphate, by heating the precipitated sulphate with dilute hydrochloric acid in a sealed tube at 150° C., by precipitating very slowly from extremely dilute solutions, or, finally, by evaporating the sulphuric acid solution of strontium sulphate to dryness. The density of the precipitated sulphate is 3.7 – 3.8, of natural celestine 3.92 – 3.96, and of artificial 3.927. The specific heat of celestine is 0.135.

Strontium sulphate melts at 1605° C., but becomes basic through loss of sulphur trioxide. There is a transition point at 1152° C. to α-SrSO4, isomorphous with α-CaSO4 and α-BaSO4, with both of which it is miscible in all proportions. Below this transition point strontium sulphate is completely miscible with barium sulphate, but only partially with calcium sulphate.

Carbon, carbon monoxide, and other reducing agents reduce it at red heat, forming the sulphide. On boiling with sodium carbonate solution it is transformed into strontium carbonate.

Under the influence of the cathode rays, strontium sulphate shows a pale lilac fluorescence, which is not materially affected by the presence of manganese, but is changed to a brilliant orange by bismuth.

Strontium sulphate is only slightly soluble in water, 1 litre of the solution at 18° C. containing 1.245 milli-equivalents, or 114.3 mgm. The heat of solution is -0.3 Cal. The solubility varies very little with temperature, but is notably increased by the presence of acids.

The solubility is diminished by dilute sulphuric acid. It is increased by alkali chlorides and nitrates, by calcium salts, and even by strontium salts, probably owing to the formation of a complex ion. The solubility is decreased by sulphates and alcohol.

A colloidal precipitate of strontium sulphate is obtained by precipitation from an alcoholic solution of strontium thiocyanate.

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