Calcium hydroxide

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Calcium hydroxide
Identifiers
CAS number 1305-62-0 YesY
PubChem 14777
ChemSpider 14094 YesY
UNII PF5DZW74VN YesY
EC nummer 215-137-3
KEGG D01083 YesY
ChEBI CHEBI:31341 YesY
RTECS nummer EW2800000
Jmol-3D images Image 1
Image 2
Properties
Molecular formula Ca(OH)2
Molar mass 74.093 g/mol
Appearance white powder
Odor odorless
Density 2.211 g/cm3, solid
Meltin pynt

580 °C (loses watter)

Solubility in water 0.189 g/100 mL (0 °C)
0.173 g/100 mL (20 °C)
0.066 g/100 mL (100 °C)
Solubility product, Ksp 4.68×10−6
Solubility Soluble in glycerol an acids.
Insoluble in alcohol.
Acidity (pKa) 12.4
Basicity (pKb) 2.37
Refractive index (nD) 1.574
Thermochemistry
Std enthalpy o
formation
ΔfHo298
−987 kJ·mol−1[1]
Staundart molar
entropy
So298
83 J·mol−1·K−1[1]
Hazards
MSDS [2]
EU Index Corrosive (C), Irritant (Xi)
R-phrases R22, R34
S-phrases (S2), S24
NFPA 704
NFPA 704.svg
0
3
0
Flash pynt Non-flammable
LD50 7340 mg/kg (oral, rat)
7300 mg/kg (mouse)
Related compounds
Ither cations Magnesium hydroxide
Strontium hydroxide
Barium hydroxide
Relatit bases Calcium oxide
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Calcium hydroxide, tradeetionally cried slaked lime, is an inorganic compoond wi the chemical formula Ca(OH)2. It is a colourless crystal or white pouder an is obtained when calcium oxide (cried lime or quicklime) is mixed, or "slaked" wi watter. It haes mony names includin hydratit lime, biggers' lime, slack lime, Choona (wird used in Indie, Pakistan an Afghanistan), cal, or picklin lime. Calcium hydroxide is uised in mony applications, includin fuid preparation. Limewatter is the common name for a saturatit solution o calcium hydroxide.

References[eedit | eedit soorce]

  1. 1.0 1.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 0-618-94690-X. 
  2. "MSDS Calcium hydroxide". Retrieved 2011-06-21.