Question

Rahul found that the Plaster of Paris, which he stored in a container, has

become very hard and lost its binding nature. What is the reason for this? Al-

so, write a chemical equation to represent the reaction taking place​

Answer 1

Final answer: Plaster of Paris become very hard and lost its binding nature due to moisture in the atmosphere.

The reaction takes place in container as follows:

                        $CaSO_{4}.\frac{1}{2}H_{2}O+ 1\frac{1}{2}H_{2}O$ → $CaSO_{4}.2H_{2}O$

                       $Plaster of Paris$                       $Gypsum$

Given that: We are given a condition, Rahul found that the Plaster of Paris which is stored in a container, has become very hard and lost its binding nature.

To find: We have to find reason and a chemical equation to represent the reaction taking place​.

Explanation:

• Plaster of Paris is calcium sulphate, its chemical formula is $CaSO_{4}.\frac{1}{2}H_{2}O$.
• Plaster of Paris become very hard and lost its binding nature due to moisture in the atmosphere. It might react with moisture that penetrates through the container and converted into gypsum in 5 to 15 minutes, which is a hard material. It makes Plaster of Paris useless.
• The properties of gypsum are entirely different from that of Plaster of Paris.
• The reaction takes place in container as follows:

                        $CaSO_{4}.\frac{1}{2}H_{2}O+ 1\frac{1}{2}H_{2}O$ → $CaSO_{4}.2H_{2}O$

                       $Plaster of Paris$                       $Gypsum$

• Dried Plaster of Paris is an extremely porous material, and as such material will absorb any moisture content in the atmosphere that touches its surface. So it will be stored in a moisture-proof container.

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