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Chemical database: Calcium oxide

chemistry tutorials - calcium oxide

Chemical formula CaO
Molar mass 56.07 g mol -1
Density 3.35 g cm -3
Melting point 2572 °C
Boiling point 2850 °C
Solubility reacts with water
CAS number 1305-78-8
Hazards chemistry tutorials - calcium oxide - additional data: (R:37/38-41)(S:26-39)

Calcium oxide, also known as quicklime, is a relatively widely used inorganic salt. It has a white color, and is caustic and alkaline. It is used in pottery, in the production of paints, in the food industry, in the production of construction materials, and also as an energy source (when mixed with water). Calcium oxide is also thought to have been one of the components of Greek fire - one of the early thermal weapons used by mankind.

Calcium oxide can be bought usually in large bags at stores that sell construction materials and equipment. However, the quality of such calcium oxide can vary a lot, since this compound easily forms calcium hydroxide when in contact with water. Fortunately, the hydroxide can simply be converted back to the oxide by heating it to about 512°C.


  Acetic acid
  Acetylsalicylic acid
  Ammonium nitrate
  Calcium carbide
  Calcium carbonate
  Calcium hydroxide
  Calcium oxide
  Hydrochloric acid
  Hydrogen peroxide
  Iron(III) oxide
  Lithium carbonate
  Methyl ethyl ketone
  Nitric acid
  Potassium carbonate
  Potassium chlorate
  Potassium chloride
  Potassium metabisulphite
  Potassium nitrate
  Potassium permanganate
  Sodium acetate
  Sodium benzoate
  Sodium bicarbonate
  Sodium bromide
  Sodium carbonate
  Sodium chloride
  Sodium hydroxide
  Sodium hypochlorite
  Sulphuric acid
  Trichloroisocyanuric acid