Calcium hydroxide

Calcium hydroxide

Names
IUPAC name Calcium hydroxide
Ither names Slaked lime Milk o lime Calcium(II) hydroxide Picklin lime Hydratit lime
Identifiers
CAS Nummer	1305-62-0 Y
3D model (JSmol)	Interactive eemage Interactive eemage
ChEBI	CHEBI:31341 Y
ChemSpider	14094 Y
EC Nummer	215-137-3
KEGG	D01083 Y
PubChem CID	14777
RTECS nummer	EW2800000
UNII	PF5DZW74VN Y
InChI InChI=1S/Ca.2H2O/h;2*1H2/q+2;;/p-2 Y Key: AXCZMVOFGPJBDE-UHFFFAOYSA-L Y InChI=1/Ca.2H2O/h;2*1H2/q+2;;/p-2 Key: AXCZMVOFGPJBDE-NUQVWONBAD
SMILES [Ca+2].[OH-].[OH-] [OH-].[OH-].[Ca+2]
Properties
Chemical formula	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)
Solubility in 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
Std enthalpy o formation ΔfHo298	−987 kJ·mol−1
Hazards
R-phrases	R22, R34
S-phrases	(S2), S24
NFPA 704	0 3 0 COR
Flash pynt	Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (Median dose)	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).
Y verify (whit is YN ?)
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.