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 Hydroxide, Sr(OH)2






Strontium Hydroxide, Sr(OH)2. - Strontium oxide may be "slaked" by water producing the hydroxide. The heat generated by this reaction is 19.44 Cal. Strontium hydroxide may be obtained as an intermediate product in the formation of strontium oxide from strontium minerals. It is prepared, for example, by the decomposition of strontium sulphide, or carbonate, by superheated steam at 500°-600° C., by the oxidation of the sulphide in a current of air in the presence of Wei don mud as catalyst, or by the action of sodium sulphate and carbon on the sulphide. It may also be formed in the dissolved state by the electrolysis of strontium chloride and sulphide solution with an iron or carbon anode.

The density of strontium hydroxide is 3.625.

By heating at 850° C. the oxide is again formed. In vacuo the greater part of the water is removed below 540° C., and dehydration is complete at 710° C.

The following values have been found for the vapour pressure of the hydroxide at different temperatures: -

Temperature, ° C.452488524561597634670706742778
Pressure in mm. Hg.9.217.431.55592149234355526760


The heat of solution of strontium hydroxide is 19.43 Cal. It is more soluble than the calcium compound, and produces a strongly basic solution. The following values have been given for the solubility: -

Temperature, ° C0204050657585101.2
Grams SrO per 100 parts solution.0.350.691.482.133.745.299.0819.34


In the presence of bases the solubility is diminished to a greater extent than can be explained by the decrease of dissociation. The influence of strontium salts is very small, probably indicating the formation of compounds, basic salts, in solution. In solutions of strontium nitrate the solubility increases with the concentration of the latter, but no basic salts have been isolated. It is readily soluble in cane sugar solutions in which it forms strontium saccharate.

The molecular conductivities of strontium hydroxide solutions have been measured by Ostwald.

Under the influence of the cathode rays, strontium hydroxide gives a beautiful deep blue phosphorescence.


Hydrates of Strontium Hydroxide

Strontium hydroxide octahydrate, Sr(OH)2.8H2O, separates as tetragonal crystals, of density 1.396, from solutions at ordinary temperatures. Berthelot ascribed to it the formula Sr(OH)2.9H2O. From vapour pressure measurements Lescoeur concluded that there was a higher hydrate than the octahydrate, and there also appear to be a hepta- and a di-hydrate. The heat of solution of the octahydrate is -14.27 Cal., and the heat of hydration from the hydroxide 24.60 Cal.

The monohydrate, Sr(OH)2.H2O, is formed by heating the octahydrate for two hours in a current of dry hydrogen at 45°-50° C., by leaving in vacuo over sulphuric acid, or by passing first air saturated with water vapour, and then dry air, at ordinary temperatures over strontium oxide. At 95° C. it loses its water of hydration, forming the simple hydroxide. The heat of solution of the monohydrate is 5.26 Cal., and the heat of hydration from the hydroxide 5.06 Cal. It absorbs carbon dioxide with complete transformation into the carbonate.

Strontium oxide forms compounds with mannitol.

Uses of Strontium Hydroxide

The use of strontia in the sugar industry for the purification of sugar by the precipitation of di-strontium saccharate was first patented by Dubrunfaut and Leplay in 1849, and introduced into the German beet-sugar factories by Fleicher in 1869. The process was modified and improved by Scheibler.
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