Calcium oxide |
| Names |
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| IUPAC name Calcium oxide |
| Ither names Quicklime, burnt lime, unslaked lime |
| Identifiers |
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| ChemSpider | |
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| RTECS nummer | EW3100000 |
| UNII | |
| UN nummer | 1910 |
InChI=1/Ca.O/rCaO/c1-2 Key: ODINCKMPIJJUCX-BFMVISLHAU
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| Properties |
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| 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 (100hPa)[2] |
| 1.19 g/L (25 °C), 0.57 g/L (100 °C), exothermic reaction[3] |
| Solubility inacids | soluble (an aa inglycerol,succar solution) |
| Solubility inmethanol | insoluble (an aa indiethyl ether,n-octanol) |
| Acidity (pKa) | 12.8 |
| Thermochemistry |
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Staundart molar
entropySo298 | 40 J·mol−1·K−1[4] |
Std enthalpy o
formation ΔfHo298 | −635 kJ·mol−1[4] |
| Hazards |
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| NFPA 704 | |
| Flash pynt | Non-flammable |
| Relatit compoonds |
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| Calcium sulfide
Calcium hydroxide |
| 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 |
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Calcium oxide (CaO), commonly kent asquicklime orburnt lime, is a widely uisedchemical compoond. It is a white,caustic,alkalinecrystalline 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, liklimestone. 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.
