Strontium hydroxide

Strontium hydroxide
Identifiers
CAS Number	18480-07-4 ; 1311-10-0 (octahydrate) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:35105 ;
ChemSpider	79094 ;
ECHA InfoCard	100.038.501
EC Number	242-367-1;
Gmelin Reference	847042
PubChem CID	87672;
UNII	EPK818UET5 ; T2B33T08R4 (octahydrate) ;
CompTox Dashboard (EPA)	DTXSID60893975 ;
	InChI InChI=1S/2H2O.Sr/h21H2;/q;;+2/p-2 Key: UUCCCPNEFXQJEL-UHFFFAOYSA-L ; InChI=1/2H2O.Sr/h21H2;/q;;+2/p-2 Key: UUCCCPNEFXQJEL-NUQVWONBAP;
	SMILES [Sr+2].[OH-].[OH-];
Properties
Chemical 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	535 °C (995 °F; 808 K) (anhydrous, 375K for octahydrate)
Boiling point	710 °C (1,310 °F; 983 K) decomposes (anhydrous)
Solubility in water	0.41 g/100 mL (0 °C) ; 1.77 g/100 mL (40 °C) ; 21.83 g/100 mL (100 °C)
Solubility	insoluble in acetone ; soluble in acid, NH4Cl
Basicity (pKb)	0.3 (first OH–), 0.83 (second OH–)
Magnetic susceptibility (χ)	−40.0·10−6 cm3/mol
Structure
Crystal structure	tetragonal (octahydrate)
Hazards
NFPA 704 (fire diamond)	1 0 1
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.

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