Calcium oxide, likewise known together quicklime, is a substance largely used in chemical market as intermediary in the cement and also concrete production and also in the soda ash synthetic process.

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Formula and structure: Calcium oxide chemical formula is CaO and also its molar mass in 56.0774 g mol-1. The molecule is developed by the calcium cation Ca+2 and also the oxygen anion O-2, which form a ionic bond. The calcium oxide ionic lattice is cubic and similar to NaCl lattice, with an ion surrounding by 6 opposite charge-ion. Its chemical structure can be composed as below, in the usual representations provided for necessary molecules.


Occurrence: Calcium oxide is discovered in nature as component of mineral Lime, which is a product composed by calcium, magnesium and aluminium carbonates, oxides and hydroxides.

Preparation: Calcium oxide is mostly derived from the lime v heating until the decomposition of material right into CaO and also CO2:

CaCO3(s) → CaO(s) + CO2(s)

Physical properties: Calcium oxide is an odorless, white to yellow, gray or brown granular powder. Its thickness is 3.34 g mL-1. The melting and also boiling points room 2613 ºC and 3850 ºC, respectively. It is soluble in water, reacting to form calcium hydroxide. Calcium oxide is insoluble in methanol and ethyl ether.

Chemical properties: Calcium oxide has actually a vast chemical reactivity. It deserve to react in countless different ways, two instances are:

Calcium oxide is used to achieve building material due to the fact that when it is mixture with water deserve to reacts to form calcium hydroxide, which rapidily forms a harden material:

CaO + H2O → Ca(OH)2

It can additionally react through fossil resources to to produce calcium carbide:

2 CaO(s) + 5 C(s) → 2 CaC2 (s) + CO2 (g)

Uses: Calcium oxide is an extremely used in the production of building materials as cement and concrete, comparable to other calcium compounds as calcium sulfate. Moreover, calcium oxide is used in the manufacturing and production the substances together soda ash, bleaching liquids, dry and desiccants and also calcium compounds. That is also used to create fertilizers and as additive in the water treatment/purification.

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Health impacts / security hazards: Calcium oxide can cause severe eye and also mucous irritantion. The is incredibly toxic by ingestion and is corrosive come the skin. When big quantities the calcium oxide are dissolved in water, the resulting reaction is extremely exothermic. It is corrosive and also can reaction violently through ethanol, phosphorus pentoxide and also acids.