Question

Write the common and chemical names of the compound CaSO⁠⁠⁠⁠⁠⁠⁠₄.0.5H₂O.

Answer 1

1. The chemical name of a compound is given on the basis of the chemical constituents of that particular compound. And, the common name is given to a compound irrespective of its chemical constituents.
2. The given chemical formula displays the presence of Calcium and sulphate ions along with water of crystallization. The chemical name will be Calcium sulphate hemihydrate.
   Thus, the common and chemical names of the compound ${\mathrm{CaSO}}_4.0.5{\mathrm{H}}_2\mathrm{O}$ is plaster of Paris and Calcium sulphate hemihydrate, respectively.