Chemicals, Elements, Formulas, Compounds, Chemistry.
historically in gunpowder. Calcium compounds: Bleaching powder (Ca(OCl)Cl): Used for bleaching textiles and paper pulp. Lime water (Ca(OH)₂): Used for testing for CO₂ and in some construction applications. Gypsum (CaSO₄ 2H₂O): Used in construction materials and as a soil amendment. Plaster of Paris