Chemicals, Elements, Formulas, Compounds, Chemistry.
base and antacid. Gypsum (CaSO₄ 2H₂O): Calcium sulfate dihydrate, used in construction materials and as a soil amendment. Plaster of Paris (CaSO₄ ½H₂O): Calcium sulfate hemihydrate, used for making casts and molds. Chalk, Limestone, and Marble (CaCO₃): Different forms of calcium carbonate, used in