When Gypsum () is heated strongly above , it loses all its water of crystallization. The resulting a — s Block Elements Chemistry Question

💡 Solution & Explanation

Heating gypsum at exactly $393\text{ K}$ forms Plaster of Paris ($CaSO_4 \cdot 0.5H_2O$). However, if it is heated above $393\text{ K}$, all the water of crystallization is lost, forming anhydrous calcium sulphate ($CaSO_4$), which is known as dead burnt plaster because it loses its ability to set with water.