Calcium oxide
Names | |
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IUPAC name
Calcium oxide
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Ither names
Quicklime, burnt lime, unslaked lime
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
PubChem CID
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RTECS nummer | EW3100000 |
UNII | |
UN nummer | 1910 |
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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[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
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Calcium sulfide Calcium hydroxide |
Ither cations
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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 | |
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.
Quicklime is relatively inexpensive. Baith it an a chemical derivative (calcium hydroxide) is important commodity chemicals.
References
[eedit | eedit soorce]- ↑ 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.