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Calcium oxide
IUPAC name
Calcium oxide
Other names
Quicklime
Identifiers
CAS number
1305-78-8
UN number
1910
RTECS number
EW3100000
Properties
Molecular formula
CaO
Molar mass
56.077 g/mol
Appearance
White to pale yellow powder
Density
3.35 g/cm3
Melting point
2572 (2845 K)
Boiling point
2850 (3123 K)
Solubility in water
reacts
Solubility in [[acids, glycerol, sugar solution]]
soluble
Solubility in [[methanol, diethyl ether, n-octanol]]
insoluble
Acidity (pKa)
12.5
Hazards
MSDS
ICSC 0409
EU Index
Not listed
Flash point
Non-flammable
Related compounds
Other anions
Calcium sulfideCalcium hydroxide
Other cations
Beryllium oxideMagnesium oxideStrontium oxideBarium oxide
Except where noted otherwise, data are given formaterials in their standard state(at 25, 100kPa)Infobox references
Calcium oxide (CaO), commonly known as burnt lime, lime or quicklime, is a widely used chemical compound. It is a white, caustic and alkaline crystalline solid at room temperature. As a commercial product, lime often also contains magnesium oxide, silicon oxide and smaller amounts of aluminium oxide and iron oxide. The name lime (native lime) refers to a very rare mineral of the CaO composition.[citation needed]
Calcium oxide is usually made by the thermal decomposition of materials such as limestone, that contain calcium carbonate (CaCO3; mineral name: calcite) in a lime kiln. This is accomplished by heating the material to above 825, a process called calcination or lime-burning, to liberate a molecule of carbon dioxide (CO2); leaving CaO. This process is reversible, since once the quicklime product has cooled, it immediately begins to absorb carbon dioxide from the air, until, after enough time, it is completely converted back to calcium carbonate.
Contents
1 Usage
2 Use as a weapon
3 References
4 External links
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Usage
As hydrated or slaked lime, Ca(OH)2 (mineral name: portlandite), it is used in mortar and plaster. Hydrated lime is very simple to make as lime is a basic anhydride and reacts vigorously with water. Lime is also used in glass production and its ability to react with silicates is also used in modern metal production industries (steel, magnesium, aluminium and others) to remove impurities as slag.
It is also used in water and sewage treatment to reduce acidity, to harden, as a flocculant, and to remove phosphates and other impurities; in paper making to dissolve lignin, as a coagulant, and in bleaching; in agriculture to improve acidic soils; and in pollution control, in gas scrubbers to desulfurize waste gases and to treat many liquid effluents. It has traditionally been used in the burial of bodies in open graves, to hide the smell of decomposition, as well as in forensic science, to reveal fingerprints. It is a refractory and a dehydrating agent and is used to purify citric acid, glucose, dyes and as a CO2 absorber. It is also used in pottery, paints and the food industry. Furthermore, quicklime is used in epidemics, plagues, and disasters to disintegrate bodies in order to help fight the spread of disease. CaO is a key ingredient in the nixtamalization process used to create corn hominy and masa or tortilla dough. In ancient India, before the discovery of soap, it was mixed with sand and used to clean ones body, while it was also used to build houses.
A relatively inexpensive substance, CaO produces heat energy by the formation of the hydrate, as in the following equation:
CaO + H2O ? Ca(OH)2 + 63.7kJ/mol of CaO
The hydrate can be reconverted to calcium oxide by removing the water in the reversible equation. If the hydrated lime is heated to redness, the CaO will be regenerated to reverse the reaction. As it hydrates, an exothermic reaction results. One litre of water combines with approximately 3.1kg of calcium oxide to give calcium hydroxide plus 3.54MJ of energy. This process can be used to provide a convenient portable source of heat, as for on-the-spot food warming in a self-heating can.
When quicklime is heated to 4,300 degrees Fahrenheit, it emits an intense glow. This form of illumination is known as a limelight and was used broadly in theatrical productions prior to the invention of electric lighting.
Annual worldwide production of calcium oxide is around 283 million metric tons. The United States and China are the largest producers, producing around 20 and 170 million metric tons, respectively.
Use as a weapon
Historian and philosopher David Hume, in his history of England, recounts how during early in the reign of Henry III the English Navy destroyed an invading French fleet, by blinding the enemy fleet with...(and so on)

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