Calcium oxide

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Calcium oxide
Identifiers
CAS number 1305-78-8 YesY
PubChem 14778
ChemSpider 14095
UNII C7X2M0VVNH
UN nummer 1910
RTECS nummer EW3100000
ATCvet code QP53AX18
Jmol-3D images Image 1
Properties
Molecular formula CaO
Molar mass 56.0774 g/mol
Appearance White tae pale yellae/broun pouder
Odor odorless
Density 3.34 g/cm3[1]
Meltin pynt

2613 °C, 2886 K, 4735 °F[1]

Boilin pynt

2850 °C, 3123 K (100 hPa)[2]

Solubility in water 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
Std enthalpy o
formation
ΔfHo298
−635 kJ·mol−1[4]
Staundart molar
entropy
So298
40 J·mol−1·K−1[4]
Hazards
MSDS [1]
EU Index Nae leetit
NFPA 704
NFPA 704.svg
0
3
2
Flash pynt Non-flammable
Related compounds
Ither anions Calcium sulfide
Calcium hydroxide
Ither cations Beryllium oxide
Magnesium oxide
Strontium oxide
Barium oxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 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 solid at ruim temperatur. The broadly uised term "lime" connotes calcium-containin inorganic materials, which include carbonates, oxides an hydroxides o calcium, silicon, magnesium, aluminium, an airn predominate, such as limestone. Bi contrast, "quicklime" specifically applies tae a single chemical compoond.

Quicklime is relatively inexpensive. Baith it an a chemical derivative (calcium hydroxide) are important commodity chemicals.

References[eedit | eedit soorce]

  1. 1.0 1.1 Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). CRC Press. p. 4.55. ISBN 1439855110. 
  2. Calciumoxid. GESTIS database
  3. 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. 
  4. 4.0 4.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 0-618-94690-X.