${\text{CaSO}}_4\cdot 2{\text{H}}_2\text{O}$ is the chemical formula of _______.

${\text{CaSO}}_4\cdot 2{\text{H}}_2\text{O}$ is Calcium Sulfate Dihydrate, commonly known as Gypsum. When heated to about $373\text{K}$, it loses water molecules to form Plaster of Paris (${\text{CaSO}}_4\cdot \frac{1}{2}{\text{H}}_2\text{O}$).