Strontium hydroxide

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Template:Chembox E numberTemplate:Chembox SolubilityInWater
Strontium hydroxide
Identifiers
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Properties
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
Melting point
Basicity (pKb) –2.19
Hazards
EU classification {{{value}}}
R-phrases R22 R36 R37 R38
Related compounds
Other anions {{{value}}}
Other cations {{{value}}}
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.

Preparation

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]

Applications

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.

Safety

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

References

  1. Brauer, Georg (1963). Handbook Of Preparative Inorganic Chemistry. Academic Press. pp. pp 935.

External links

de:Strontiumhydroxid


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