A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance, which can be molded into different shapes by making its dough. When this compound is left in the open for some time, it becomes a solid mass and cannot be used for molding purposes. Identify the sulphate salt, and why does it show such behavior? Give the reaction involved.
A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance, which can be molded into different shapes by making its dough. When this compound is left in the open for some time, it becomes a solid mass and cannot be used for molding purposes. Identify the sulphate salt, and why does it show such behavior? Give the reaction involved.
  1. Plaster of Paris is calcium sulphate which is white in colour and has soft texture.

2. Gypsum is a hard compound which is used for molding purposes and is formed when Plaster of Paris is left open for some time and it absorbs moisture to get lots of molecules of crystallization.