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Calcium Oxide
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Properties


General
Name Calcium oxide
Chemical Formula Ca O
Appearance White solid


Physical
Formula Weight 56.1 Amu
Melting Point 2572 °C (2845 K )
Boiling Point 2850 °C (3123 K )
Density 3.3-3.4 ×103 Kg / M 3
Crystal Structure Face-Centered Cubic
Solubility hydrolysed


Thermochemistry
ΔfH0gas 43.93 KJ / Mol
ΔfH0liquid −557.33 kJ/mol
ΔfH0solid −635.09 kJ/mol
S0gas, 1 Bar 219.71 J/mol·K
S0liquid, 1 bar 62.31 J/mol·K
S0solid 38.19 J/mol·K


Safety

Ingestion
Inhalation Dangerous - irritation; chemical bronchitis or even death for larger exposures.
Skin Irritation and possible burns.
Eyes May cause permanent damage.
More info Hazardous Chemical Database


SI units were used where possible. Unless otherwise stated, Standard conditions were used.

Disclaimer And References



Calcium oxide (CaO), commonly known as '''lime''', '''quicklime''' or '''burnt lime''', is a widely used Chemical Compound . It is a white, Caustic and Alkali ne Crystalline solid. As a commercial product lime often also contains Magnesium oxide, Silicon oxide and smaller amounts of Aluminium oxide and Iron oxide.

.

As hydrated or ), it was used in Mortar and Plaster to increase the rate of hardening. Hydrate d lime is very simple to make as lime is a basic Anhydride and reacts vigorously with Water . Lime was also used in Glass production and its ability to work with silicates is also used in modern metal production ( Steel , Magnesium , Aluminium and other non-ferrous metals) industries to remove impurities as Slag .

It is also used in water and sewage treatment to reduce Acid ity, to soften, as a Flocculant and to remove Phosphate s and other impurities; in Paper making to dissolve Lignin , as a Coagulant and in Bleach ing; in agriculture to improve acid Soil s; and in Pollution control - in gas scrubbers to Desulfur ize waste gases and to treat many liquid effluents. It is a refactory and a dehydrating agent and is used to purify Citric Acid , Glucose , Dye s and as a CO2 absorber. It is also used in Pottery , Concrete , Paint s and the food industry, where it is sometimes used (in conjunction with water) to heat items like MRE s (Meals Ready To Eat) and coffee.


See also

Factors Affecting the Quality of Quicklime