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.
Quick facts Names, Identifiers ...
Calcium oxide
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| Names |
| IUPAC name
Calcium oxide |
| Ither names
Quicklime, burnt lime, unslaked lime |
| Identifiers |
CAS Nummer |
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3D model (JSmol) |
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| ChemSpider |
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| RTECS nummer |
EW3100000 |
| UNII |
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| 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 (100 hPa)[2] |
Solubility in watter |
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 So298 |
40 J·mol−1·K−1[4] |
Std enthalpy o
formation ΔfHo298 |
−635 kJ·mol−1[4] |
| Hazards |
| NFPA 704 |
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| 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 |
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Close
Quicklime is relatively inexpensive. Baith it an a chemical derivative (calcium hydroxide) is important commodity chemicals.
