Calcium oxide

Calcium oxide
Calcium oxide
Names
IUPAC name
Calcium oxide
Ither names
Quicklime, burnt lime, unslaked lime
Identifiers
3D model (JSmol)
ChemSpider
RTECS nummer EW3100000
UNII
UN nummer 1910
Properties
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]
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
NFPA 704 four-colored diamondFlammability code 0: Will nae burn. E.g., watterHealth code 3: Short exposur could cause serious temporary or residual injury. E.g., chlorine gasReactivity code 2: Unnergangs violent chemical chynge at elevatit temperatures an pressurs, reacts violently wi water, or mey form explosive mixturs wi watter. E.g., phosphorusSpecial hazards (white): no code
0
3
2
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

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.

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

References

  1. ↑ a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nt ed.). CRC Press. p. 4.55. ISBN 1439855110.
  2. ↑ Calciumoxid Archived 2013-12-30 at the Wayback Machine. 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.CS1 maint: multiple names: authors leet (link)
  4. ↑ a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 0-618-94690-X.

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