Question 13
Plaster of Paris should be stored in a moisture-proof container. Explain why.

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Solution

The plaster of paris should be stored in a moisture-proof container because it absorbs moisture (water) from the atmosphere easily and turns into a hard substance (gypsum).

${CaSO}_{4} . \frac{1}{2} H_{2} O + 1 \frac{1}{2} H_{2} O \to {CaSO}_{4} .2 H_{2} O Plaster of paris Gypsum$

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Q. Question 13
Plaster of Paris should be stored in a moisture-proof container. Explain why.

Q. (a) What is plaster of Paris? Write the chemical formula of plaster of Paris.
(b) How is plaster of Parish prepared? Write chemical equation of the reaction involved.
(c) Explain why plaster of Paris should be stored in a moisture-proof container.
(d) State two important uses of plaster of Paris.

Q. (a) What are the common names of (a) CaOCl₂, and (b) Na₂CO₃.10H₂O?
(b) Why should plaster of Paris be stored in a moisture-proof container?
(c) Explain why, while diluting a concentrated acid, acid should be added to water and not water to the acid.

Give reasons for the following –
a) Why is sodium kept immersed in kerosene oil?
b) Why calcium metal after reaction with water starts floating on it?
c) Why plaster of Paris should be stored in a moisture proof container?
d) Why is baking soda used as an antacid?
e) Why does an aqueous solution of acid conduct electricity?

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Plaster of Paris

Standard X Chemistry

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Question 13 Plaster of Paris should be stored in a moisture-proof container. Explain why.

The plaster of paris should be stored in a moisture-proof container because it absorbs moisture (water) from the atmosphere easily and turns into a hard substance (gypsum). CaSO4.12H2O+112H2O→CaSO4.2H2O Plaster of paris Gypsum

Question 13
Plaster of Paris should be stored in a moisture-proof container. Explain why.

The plaster of paris should be stored in a moisture-proof container because it absorbs moisture (water) from the atmosphere easily and turns into a hard substance (gypsum).

${CaSO}_{4} . \frac{1}{2} H_{2} O + 1 \frac{1}{2} H_{2} O \to {CaSO}_{4} .2 H_{2} O Plaster of paris Gypsum$