Strontium hydroxide
| Identifiers | |
|---|---|
18480-07-4  1311-10-0 (octahydrate)  | |
| ChEBI | CHEBI:35105 |
| ChemSpider | 79094 |
| EC Number | 242-367-1 |
| Jmol interactive 3D | Image |
| PubChem | 87672 |
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| Properties | |
| 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 | 535 °C (995 °F; 808 K) (anhydrous, 375K for octahydrate) |
| Boiling point | 710 °C (1,310 °F; 983 K) decomposes (anhydrous) |
| 0.41 g/100 mL (0 °C) 1.77 g/100 mL (40 °C) 21.83 g/100 mL (100 °C) [1] | |
| Solubility | insoluble in acetone soluble in acid, NH4Cl |
| Basicity (pKb) | −2.19 |
| Structure | |
| tetragonal (octahydrate) | |
| Hazards | |
| Flash point | Non-flammable |
| Related compounds | |
| Other anions |
Strontium oxide Strontium peroxide |
| Other cations |
Beryllium hydroxide Magnesium hydroxide Calcium hydroxide Barium hydroxide |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| verify (what is ?) | |
| 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.
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
- ↑ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
- ↑ Brauer, Georg (1963). Handbook Of Preparative Inorganic Chemistry. Academic Press. p. 935.
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