Calcium oxide

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Calcium oxide
ChEBI
DrugBank
Gmelin Reference 485425
KEGG
PubChem {{{value}}}
RTECS number EW3100000
SMILES {{{value}}}
CaO
Molar mass 56.0774 g/mol
Appearance White to pale yellow/brown powder
Odor Odorless
Density 3.34 g/cm3[1]
Melting point Template:Chembox CalcTemperatures
Boiling point Template:Chembox CalcTemperatures
Solubility in Methanol Insoluble (also in diethyl ether, octanol)
Acidity (pKa) 12.8
Cubic, cF8
Thermochemistry
Std enthalpy of
formation
ΔfHo298
−635 kJ·mol−1[3]
Standard molar
entropy
So298
40 J·mol−1·K−1[3]
Hazards
NFPA 704
0
3
2
 
Flash point Non-flammable
U.S. Permissible
exposure limit (PEL)
TWA 5 mg/m3[4]
Related compounds
Other anions Calcium sulfide
Calcium hydroxide
Other cations Beryllium oxide
Magnesium oxide
Strontium oxide
Barium oxide
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Calcium oxide is a chemical compound of calcium and oxygen. Its chemical formula is CaO. It is known as quicklime. It is made in a lime kiln. It releases heat when dissolved in water and changes into calcium hydroxide. It is a white powder.

It is also a base. It reacts with acids to make calcium salts. Quicklime is an important ingredient of cement

Related pages

References