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Strontium hydroxide

Strontium hydroxide
Molecular formula Sr(OH)2
Molar mass 121.63468 g·mol–1 (anhydrous)
139.64996 g·mol–1 (monohydrate)
265.75692 g·mol–1 (octahydrate)
Appearance prismatic colourless crystals
CAS number [18480-07-4] (anhydrous)
Density (solid) 3.63 g·cm–3 (anhydrous)
Solubility in water insoluble
Melting point 375°C (anhydrous)
Boiling point
Basicity (pKb) –2.19
Crystal structure  ?
MSDS External MSDS
EU classification Harmful (Xn)
NFPA 704
R-phrases R22 R36 R37 R38
Flash point
RTECS number
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Other anions Strontium oxide
Strontium peroxide
Other cations Calcium hydroxide
Barium hydroxide
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Strontium hydroxide, Sr(OH)2, is a caustic alkali composed of one strontium ion and two hydroxide ions. It is synthesized by combining a strontium salt with a strong base. Sr(OH)2 exists in anhydrous, monohydrate, or octahydrate form.



Because Sr(OH)2 is very slightly soluble in water, its preparation can be easily carried out by the addition of a strong base such as NaOH or KOH, drop by drop to a solution of any strontium salt, most commonly Sr(NO3)2 (strontium nitrate). The Sr(OH)2 will precipitate out as a fine white powder. From here, the solution is filtered, and the Sr(OH)2 is washed with cold water and dried.[1]


Strontium hydroxide is used chiefly in the refining of beet sugar and as a stabilizer in plastic. It may be used as a source of strontium ions when the chlorine from strontium chloride is undesirable. Strontium hydroxide absorbs carbon dioxide from the air to form strontium carbonate.


Strontium hydroxide is a severe skin, eye and respiratory irritant. It is harmful if swallowed.


  1. ^ Brauer, Georg (1963). Handbook Of Preparative Inorganic Chemistry. Academic Press, pp 935. 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Strontium_hydroxide". A list of authors is available in Wikipedia.
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