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.
Quick Facts Names, Identifiers ...
Calcium hydroxide
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| Names |
| IUPAC name
Calcium hydroxide |
| Ither names
Slaked lime
Milk o lime
Calcium(II) hydroxide
Picklin lime
Hydratit lime |
| Identifiers |
CAS Nummer |
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3D model (JSmol) |
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| ChEBI |
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| ChemSpider |
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| EC Nummer |
215-137-3 |
| KEGG |
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| RTECS nummer |
EW2800000 |
| UNII |
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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
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SMILES
[Ca+2].[OH-].[OH-] [OH-].[OH-].[Ca+2]
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| 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) |
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[1] |
Std enthalpy o
formation ΔfHo298 |
−987 kJ·mol−1[1] |
| Hazards |
| R-phrases |
R22, R34 |
| S-phrases |
(S2), S24 |
| NFPA 704 |
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| 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 |
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