Strontium hydroxide
| Strontium hydroxide | ||
|---|---|---|
| Identifiers | ||
| CAS number | 18480-07-4  , 1311-10-0 (octahydrate) | |
| PubChem | 87672 | |
| ChemSpider | 79094 | |
| EC number | 242-367-1 | |
| ChEBI | CHEBI:35105 | |
| Jmol-3D images | {{#if:[Sr+2].[OH-].[OH-]|Image 1 | |
| ||
| ||
| 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 | |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 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.
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.
External links
| |||||