Calcium oxide

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Calcium oxide
Calcium oxide
Names
IUPAC name
Calcium oxide
Ither names
Quicklime, burnt lime, unslaked lime
Identifiers
1305-78-8 N
ATC code
ChemSpider 14095
Jmol-3D images Image
PubChem
RTECS nummer EW3100000
UNII C7X2M0VVNH
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
Std enthalpy o
formation
ΔfHo298
−635 kJ·mol−1[4]
Staundart molar
entropy
So298
40 J·mol−1·K−1[4]
Hazards
Safety data sheet [1]
NFPA 704
Flammability code 0: Will nae burn. E.g., watter Health code 3: Short exposur could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 2: Unnergangs violent chemical chynge at elevatit temperatures an pressurs, reacts violently wi water, or mey form explosive mixturs wi watter. E.g., phosphorus Special hazards (white): no codeNFPA 704 four-colored diamond
Flash pynt Non-flammable
Related compounds
Ither anions Calcium sulfide
Calcium hydroxide
Ither cations Beryllium oxide
Magnesium oxide
Strontium oxide
Barium oxide
Except whaur otherwise 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 solid 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, like 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[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.