Strontium hydroxide

Strontium hydroxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.038.501 Edit this at Wikidata
EC Number
  • 242-367-1
847042
UNII
  • InChI=1S/2H2O.Sr/h2*1H2;/q;;+2/p-2 checkY
    Key: UUCCCPNEFXQJEL-UHFFFAOYSA-L checkY
  • InChI=1/2H2O.Sr/h2*1H2;/q;;+2/p-2
    Key: UUCCCPNEFXQJEL-NUQVWONBAP
  • [Sr+2].[OH-].[OH-]
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) 0.3 (first OH–), 0.83 (second OH–)[2]
−40.0·10−6 cm3/mol
Structure
tetragonal (octahydrate)
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
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).
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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.

  1. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
  2. ^ "Sortierte Liste: pKb-Werte, nach Ordnungszahl sortiert. - Das Periodensystem online" (in German).