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.
| |
| Names | |
|---|---|
| IUPAC name
Calcium oxide
| |
| Ither names
Quicklime, burnt lime, unslaked lime
| |
| Identifiers | |
3D model (JSmol)
|
|
| ChemSpider | |
PubChem CID
|
|
| RTECS nummer | EW3100000 |
| UNII | |
| UN nummer | 1910 |
| |
| |
| Properties | |
| CaO | |
| Molar mass | 56.0774 g/mol |
| Appearance | White tae fauch yellae/broun pouder |
| Odour | odorless |
| Density | 3.34 g/cm3[1] |
| Meltin pynt | 2613 °C, 2886 K, 4735 °F[1] |
| Bylin pynt | 2850 °C, 3123 K (100 hPa)[2] |
| 1.19 g/L (25 °C), 0.57 g/L (100 °C), exothermic reaction[3] | |
| 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[4] |
| Std enthalpy o formation ΔfH |
−635 kJ·mol−1[4] |
| Hazards | |
| NFPA 704 | |
| 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
eedit- ↑ a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nt ed.). CRC Press. p. 4.55. ISBN 1439855110.
- ↑ Calciumoxid Archived 2013-12-30 at the Wayback Machine. GESTIS database
- ↑ Committee on Water Treatment Chemicals, Food and Nutrition Board, Assembly of Life Sciences, National Research Council (1982). Water Chemicals Codex. p. 20. ISBN 0-309-07368-5.CS1 maint: multiple names: authors leet (link)
- ↑ a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 0-618-94690-X.