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**Molecular formula:** CaO
**Molar mass:** 56,08 g/mol
**Information:** Calcium oxide (burnt lime) is a basic, white crystalline substance. It is an ionic compound containing a calcium Ca²⁺ cation and oxide anion O²⁻.
**Use:** It is formed by the decomposition of calcium carbonate (CaCO₃ → CaO + CO₂). By reacting calcium oxide with water (CaO + H₂O → Ca(OH)₂), slaked lime is produced which is used to form lime mortar (mixture of slaked lime, water and sand). Burned lime is used as a fertilizer or for the production of glass.
