Strontium hydroxide
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| Strontium hydroxide | |
|---|---|
| Image:Strontium hydroxide.jpg | |
| General | |
| Molecular formula | Sr(OH)2 |
| Molar mass | - 121.63468 g/mol (anhydrous) - 139.64996 g/mol (monohydrate) - 265.75692 g/mol (octahydrate) |
| Appearance | prismatic colourless crystals |
| CAS number | [18480-07-4] (anhydrous) |
| Properties | |
| Density (solid) | 3.63 g/cm3 (anhydrous) |
| Solubility in water | insoluble |
| Melting point | 375 °C (anhydrous) |
| Boiling point | |
| Basicity (pKb) | -2.19 |
| Structure | |
| Coordination geometry |
? |
| Crystal structure | ? |
| Thermodynamic data | |
| Std enthalpy change of formation, ΔfH |
−kJ/mol |
| Standard molar entropy, S |
J.K−1.mol−1 |
| Hazards | |
| MSDS | External MSDS |
| EU classification | Harmful (Xn) |
| NFPA 704 | |
| R-phrases | R22 R36 R37 R38 |
| S-phrases | |
| Flash point | |
| RTECS number | |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
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 |
|
Contents |
[edit] 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 (the nitrate is the one of which is most commonly used). 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]
[edit] Uses
Used chiefly in the refining of beet sugar and as a stabilizer in plastic. It is used primarily when strontium ions are needed in solution, but chloride ions are undesirable.
[edit] Safety
Severe skin, eye and respiratory irritant. Harmful if swallowed.
[edit] References
- ^ Brauer, Georg (1963). Handbook Of Preparative Inorganic Chemistry. Academic Press, pp 935.
