Calcium Oxide
Calcium oxide (CaO), commonly kent as quicklime or burnt lime, is a widely uised chemical compoond.
It is a white, caustic, alkaline crystalline solit at ruim temperatur. The braid uised term "lime" connotes calcium-containin inorganic materials, that include carbonates, oxides an hydroxides o calcium, silicon, magnesium, aluminium, an airn predominate, lik limestone. Bi contrast, "quicklime" specifically applies tae a single chemical compoond.
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| Names | |
|---|---|
| IUPAC name Calcium oxide | |
| Ither names Quicklime, burnt lime, unslaked lime | |
| Identifiers | |
CAS Nummer | |
3D model (JSmol) | |
| ChemSpider | |
PubChem CID | |
| RTECS nummer | EW3100000 |
| UNII | |
| UN nummer | 1910 |
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SMILES
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| Properties | |
| CaO | |
| Molar mass | 56.0774 g/mol |
| Appearance | White tae fauch yellae/broun pouder |
| Odour | odorless |
| Density | 3.34 g/cm3 |
| Meltin pynt | 2613 °C, 2886 K, 4735 °F |
| Bylin pynt | 2850 °C, 3123 K (100 hPa) |
Solubility in watter | 1.19 g/L (25 °C), 0.57 g/L (100 °C), exothermic reaction |
| Solubility in acids | soluble (an aa in glycerol, succar solution) |
| Solubility in methanol | insoluble (an aa in diethyl ether, n-octanol) |
| Acidity (pKa) | 12.8 |
| Thermochemistry | |
| Staundart molar entropy S | 40 J·mol−1·K−1 |
| Std enthalpy o formation ΔfH | −635 kJ·mol−1 |
| Hazards | |
| NFPA 704 |  0 3 2 |
| Flash pynt | Non-flammable |
| Relatit compoonds | |
Ither anions | Calcium sulfide Calcium hydroxide |
Ither cations | Beryllium oxide Magnesium oxide Strontium oxide Barium oxide |
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Quicklime is relatively inexpensive. Baith it an a chemical derivative (calcium hydroxide) is important commodity chemicals.
References
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