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**Molecular formula:** Ca(OH)₂ **Molar mass:** 74.093 g/mol **Description:** Calcium hydroxide, also known as slaked lime, is a strong alkaline, white crystalline substance. It is poorly soluble in water; the resulting suspension is referred to as "milk of lime". This compound is ionic in nature, consisting of calcium cations (Ca²⁺) and hydroxide anions (OH⁻). When dissolved in water in a dilute form, it is known as "limewater". **Applications:** Calcium hydroxide is produced through the reaction of calcium oxide (quicklime) with water: CaO + H₂O → Ca(OH)₂. Lime water is also used to detect the presence of carbon dioxide.
