Linked from
The 18 pages that link to Calcium hydroxide, each with the reason it gives.
CalciumRelated: This reaction shows how calcium compounds change when exposed to water.
Lime mortarRelated: It reacts with carbon dioxide as lime mortar hardens.
PlasterRelated: It is the principal binder in nonhydraulic lime plaster before carbonation.
Calcium carbideRelated: It forms alongside acetylene when calcium carbide reacts with water.