Calcium oxide
- Formula: CaO
- Hill system formula: Ca1O1
- CAS registry number: [1305-78-8]
- Formula weight: 56.077
- Class: oxide
- Colour: white or pale grey
- Appearance: crystalline solid
- Melting point: 2900 °C
- Boiling point:
- Density: 3340 kg m-3
The following are some synonyms of calcium oxide:
- calcium oxide
- calcium(II) oxide
- lime
The oxidation number of calcium in calcium oxide is 2.
Synthesis
Calcium oxide can be made by the calcination (heating) of chalk or calcium hydroxide.
CaCO3(s) (heat) → CaO(s)
Ca(OH)2(s) (heat) → CaO(s) + H2O(l)
Solid state structure
- Geometry of calcium: 6 coordinate: octahedral
- Prototypical structure: NaCl (rock salt)
Element analysis
The table shows element percentages for CaO (calcium oxide).
| Element | % |
|---|---|
| Ca | 71.47 |
| O | 28.53 |
Isotope pattern for CaO
The chart below shows the calculated isotope pattern for the formula CaO with the most intense ion set to 100%.
References
The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.
- R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
- N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
- F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
- A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
- R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
- A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
- A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
- J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
- D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
- J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
- J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.