Calcium oxide
Calcium oxide is a chemical compound of calcium and oxygen. Its chemical formula is CaO. It is known as quicklime. It is made in a lime kiln. It releases heat when dissolved in water and changes into calcium hydroxide. It is a white powder.
| Names | |
|---|---|
| IUPAC name
Calcium oxide | |
| Other names
Quicklime, burnt lime, unslaked lime, pebble lime, calcia | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.013.763 |
| E number | E529 (acidity regulators, ...) |
| Gmelin Reference | 485425 |
PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 1910 |
CompTox Dashboard (EPA) |
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SMILES
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| Properties | |
| CaO | |
| Molar mass | 56.0774 g/mol |
| Appearance | White to pale yellow/brown powder |
| Odor | Odorless |
| Density | 3.34 g/cm3[1] |
| Melting point | 2,613 °C (4,735 °F; 2,886 K)[1] |
| Boiling point | 2,850 °C (5,160 °F; 3,120 K) (100 hPa)[2] |
| Reacts to form calcium hydroxide | |
| Solubility in Methanol | Insoluble (also in diethyl ether, octanol) |
| Acidity (pKa) | 12.8 |
| −15.0×10−6 cm3/mol | |
| Structure | |
| Cubic, cF8 | |
| Thermochemistry | |
| Std enthalpy of formation ΔfH |
−635 kJ·mol−1[3] |
| Standard molar entropy S |
40 J·mol−1·K−1[3] |
| Pharmacology | |
ATCvet code |
QP53AX18 (WHO) |
| Hazards | |
| NFPA 704 |
0
3
2
|
| Flash point | Non-flammable |
| U.S. Permissible exposure limit (PEL) |
TWA 5 mg/m3[4] |
| Related compounds | |
| Other anions | Calcium sulfide Calcium hydroxide |
| Other cations | Beryllium oxide Magnesium oxide Strontium oxide Barium oxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
It is also a base. It reacts with acids to make calcium salts. Quicklime is an important ingredient of cement.
Related pages
References
- Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.55. ISBN 1439855110.
- Calciumoxid Archived 2013-12-30 at the Wayback Machine. GESTIS database
- Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 978-0-618-94690-7.
- NIOSH Pocket Guide to Chemical Hazards. "#0093". National Institute for Occupational Safety and Health (NIOSH).
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