Base anhydride

A basic oxide that reacts with water to form a base. Calcium oxide, for example, reacts with water to produce calcium hydroxide.

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Calcium oxide: An ionic solid that reacts with water to form calcium hydroxide and with acids to form calcium salts. Its hydration is the standard example of a base anhydride forming a hydroxide.
Oxide: A chemical compound in which oxygen is bonded to another element. Base anhydrides belong to the broader class of oxides.
Portland cement: A hydraulic cement made chiefly from calcium silicate phases that harden through reactions with water. Quicklime and related calcium compounds are central to cement manufacture and processing.
Acid anhydride: An oxide that forms an acid when it reacts with water, or forms salts with bases. It shows the opposite acid–base behavior from an oxide that forms a base.
Calcium hydroxide: An inorganic base, Ca(OH)₂, formed when calcium oxide reacts with water. It is the hydroxide product of calcium oxide hydration.
Base: A substance that accepts protons or increases hydroxide-ion concentration in aqueous solution, depending on the definition used. A base anhydride forms a base through reaction with water.
Lime mortar: A building mortar made with lime, sand, and water that hardens mainly through carbonation. Quicklime can be slaked to make the calcium hydroxide used in lime mortar.
Acidic oxide: An oxide that reacts with bases to form salts and often water. Acidic oxides tend toward acids or acidic products rather than hydroxide bases.
Hydration reaction: A chemical reaction in which a substance combines with water or incorporates water into its structure. Base anhydrides undergo hydration when water produces their corresponding hydroxides.
Hydroxide: A compound containing the hydroxide ion, OH⁻, or the hydroxide group bonded to another element. Many base anhydrides form metal hydroxides when hydrated.