Calcium hydroxide

Frae Wikipedia
Lowp tae: navigation, rake
Calcium hydroxide
Calcium hydroxide
Names
IUPAC name
Calcium hydroxide
Ither names
Slaked lime
Milk o lime
Calcium(II) hydroxide
Picklin lime
Hydratit lime
Identifiers
Jmol-3D images Image
Image
ChEBI CHEBI:31341 YesY
ChemSpider 14094 YesY
ECHA InfoCard 100.013.762
EC Nummer 215-137-3
E nummer E526 (acidity regulators, ...)
KEGG D01083 YesY
PubChem
RTECS nummer EW2800000
UNII PF5DZW74VN YesY
Properties
Ca(OH)2
Molar mass 74.093 g/mol
Appearance white powder
Odour odorless
Density 2.211 g/cm3, solid
Meltin pynt 580 °C (loses watter)
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
Staundart molar
entropy
So298
83 J·mol−1·K−1[1]
Std enthalpy o
formation
ΔfHo298
−987 kJ·mol−1[1]
Hazards
Safety data sheet [2]
R-phrases R22, R34
S-phrases (S2), S24
NFPA 704
Flammability code 0: Will nae burn. E.g., watter Health code 3: Short exposur could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even unner fire exposur condeetions, an is nae reactive wi watter. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash pynt Non-flammable
Lethal dose or concentration (LD, LC):
7340 mg/kg (oral, rat)
7300 mg/kg (mouse)
Relatit compoonds
Ither cations
Magnesium hydroxide
Strontium hydroxide
Barium hydroxide
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
YesY verify (whit is YesYN ?)
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" (PDF). Retrieved 2011-06-21.