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Strontium hydroxide

 
Sci-Tech Dictionary: strontium hydroxide
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(′strän·tē·əm hī′dräk′sīd)

(inorganic chemistry) Sr(OH)2 Colorless deliquescent crystals that absorb carbon dioxide from air, soluble in hot water and acids, melts at 375°C; used by the sugar industry, in lubricants and soaps, and as a plastic stabilizer. Also known as strontium hydrate.

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Strontium hydroxide
Identifiers
CAS number 18480-07-4 Yes check.svgY,
1311-10-0 (octahydrate)
Properties
Molecular formula Sr(OH)2
Molar mass 121.63 g/mol (anhydrous)
139.65 g/mol (monohydrate)
265.76 g/mol (octahydrate)
Appearance prismatic colourless crystals
deliquescent
Density 3.625 g/cm3 (anhydrous)
1.90 g/cm3 (octahydrate)
Melting point

375 °C (anhydrous)
Boiling point

710 °C, decomp (anhydrous)
Solubility in water 0.41 g/100 mL (0 °C)
1.77 g/100 mL (20 °C)
21.83 g/100 mL (100 °C) [1]
Solubility insoluble in acetone
soluble in acid, NH4Cl
Basicity (pKb) −2.19
Structure
Crystal structure tetragonal (octahydrate)
Hazards
EU Index Not listed
Flash point Non-flammable
Related compounds
Other anions Strontium oxide
Strontium peroxide
Other cations Beryllium hydroxide
Magnesium hydroxide
Calcium hydroxide
Barium hydroxide
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox 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.

Contents

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.[2]

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. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0070494398
  2. ^ Brauer, Georg (1963). Handbook Of Preparative Inorganic Chemistry. Academic Press. p. 935. 

External links


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