:Strontium hydroxide
{{chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 470471457
| ImageFile = Sr(OH)2.png
| ImageSize = 250px
| Name = Strontium hydroxide
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 79094
| InChI = 1/2H2O.Sr/h2*1H2;/q;;+2/p-2
| InChIKey = UUCCCPNEFXQJEL-NUQVWONBAP
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 35105
| SMILES = [Sr+2].[OH-].[OH-]
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/2H2O.Sr/h2*1H2;/q;;+2/p-2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = UUCCCPNEFXQJEL-UHFFFAOYSA-L
| CASNo = 18480-07-4
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo2_Ref = {{cascite|correct|CAS}}
| CASNo2 = 1311-10-0
| CASNo2_Comment = (octahydrate)
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = EPK818UET5
| UNII2_Ref = {{fdacite|correct|FDA}}
| UNII2 = T2B33T08R4
| UNII2_Comment = (octahydrate)
| PubChem = 87672
| EINECS = 242-367-1
| Gmelin = 847042
}}
|Section2={{Chembox Properties
| Formula = Sr(OH)2
| MolarMass = 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)
| Solubility = 0.41 g/100 mL (0 °C)
1.77 g/100 mL (40 °C)
21.83 g/100 mL (100 °C) Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, {{ISBN|0-07-049439-8}}
| SolubleOther = insoluble in acetone
soluble in acid, NH4Cl
| MeltingPtC = 535
| MeltingPt_notes = (anhydrous, 375K for octahydrate)
| BoilingPtC = 710
| BoilingPt_notes = decomposes (anhydrous)
| pKb = 0.3 (first OH–), 0.83 (second OH–){{cite web|language=de|url=http://www.periodensystem-online.de/index.php?show=list&id=acid&prop=pKb-Werte&sel=oz&el=92|title=Sortierte Liste: pKb-Werte, nach Ordnungszahl sortiert. - Das Periodensystem online}}
| MagSus = −40.0·10−6 cm3/mol
}}
|Section3={{Chembox Structure
| Coordination =
| CrystalStruct = tetragonal (octahydrate)
}}
|Section7={{Chembox Hazards
| ExternalSDS =
| HPhrases =
| PPhrases =
| GHS_ref =
| FlashPt = Non-flammable
|NFPA-H=1
|NFPA-F=0
|NFPA-R=1
}}
|Section8={{Chembox Related
| OtherAnions = Strontium oxide
Strontium peroxide
| OtherCations = Beryllium hydroxide
Magnesium hydroxide
Calcium hydroxide
Barium hydroxide
}}
}}
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 slightly soluble in cold 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 soluble 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.{{cite book
| last = Brauer
| first = Georg
| title = Handbook Of Preparative Inorganic Chemistry
| publisher = Academic Press
| year = 1963
| page = 935 }}
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
{{reflist}}
External links
- http://www.chemicalland21.com/industrialchem/inorganic/STRONTIUM%20HYDROXIDE.htm
{{Strontium compounds}}
{{Hydroxides}}
{{Authority control}}