Chemical elements
  Strontium
    Isotopes
    Energy
    Production
    Application
    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 Bromide, SrBr2






Strontium Bromide, SrBr2, may be obtained by dissolving the oxide, carbonate, or sulphide in hydrobromic acid, evaporating to dryness, and heating the residue in a current of the gaseous acid. A gelatinous strontium bromide has also been obtained.

The heat of formation of strontium bromide from its elements is 176.5 Cal.

It is a colourless salt, melting without decomposition at 643° C., and volatilising at 770° C. It can be heated to dryness in a platinum dish over a free flame without the slightest loss of halogen.

The salt dried at 200° C. has a density of 4.216 at 24° C.

The fused salt is less hygroscopic than the powdered.

Strontium bromide is readily soluble in water, the heat of solution Being 16.1 Cal.

Densities of strontium bromide solutions, vapour pressures, freezing-points, electrical conductivities, and refractive indices, have been determined.


The Hydrates of Strontium Bromide

The existence of two hydrates, the hexa- and the mono-hydrate, has been definitely established, but there is probably also a dihydrate, and Thomsen considered that calorimetric determinations indicated the existence of four hydrates, with 1, 2, 5, and 6 molecules of water of crystallisation respectively.

Strontium Bromide Hexahydrate, SrBr2,6H2O

The experiments of Rammelsberg first indicated the existence of Strontium Bromide Hexahydrate, SrBr2.6H2O, isomorphous with the chloride hexahydrate. It is hygroscopic, and melts at 100° C. in its own water of crystallisation. The vapour pressure of the salt at 20° C. is 1.8 mm. The heat of hydration is 23.33 Cal., and the heat of solution of the hydrate -7.22 Cal. The density is 2.358.

Strontium Bromide Dihydrate, SrBr2,2H2O

According to Richards and Yngve, transition from the hexahydrate to the dihydrate takes place at 88.62° C. The heat of hydration to the Strontium Bromide Dihydrate, SrBr2.2H2O, is 9.95 Cal., and the heat of solution 6.16 Cal.

Strontium Bromide Monohydrate, SrBr2,H2O

The hexahydrate loses 5 molecules of water in the desiccator, or at 100° C. in air, giving the Strontium Bromide Monohydrate, SrBr2.H2O. The heat of hydration is 6.15 Cal., and the heat of solution 9.96 Cal.

Addition Compounds of Strontium Bromide

With ammonia strontium bromide forms the compound SrBr2.8NH3, SrBr2.2NH3, and SrBr2.NH3, which have a dissociation pressure of 100 mm. at the temperatures 30°, 68°, and 146° C. respectively, and the heats of formation 10.9, 12.8, and 16.2 Cal. There is also evidence of the existence of a labile isomeride of the di- ammoniate with a pressure of 143 mm. at 63° C. The anhydrous salt is soluble in ethyl alcohol, and from the solution the compound 2SrBr2.5C2H5OH crystallises out in large orthorhombic prisms. An addition compound with glycine, SrBr2.2NH2CH2COOH.3H2O, has also been obtained.

Double Salts of Strontium Bromide

Strontium bromide forms double salts with mercuric bromide, 2HgBr2.SrBr2, and SrBr2.HgBr2, and with mercuric cyanide, 2Hg(CN)2.SrBr2.6H2O. Freezing-point curves of mixtures of strontium bromide with bromides of the alkali metals, indicate the existence of the compounds 2SrBr2.LiBr, SrBr2.2KBr, and 2SrBr2.KBr.
© Copyright 2008-2012 by atomistry.com