Identify the correct statement [1995]a)gypsum is obtained by heating p...
Gypsum is CaSO4. 2H2O and plaster of Paris i s (CaSO4)2 .H2O. Therefore gypsum contains a lower percentage of calcium than plaster of Paris.
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Identify the correct statement [1995]a)gypsum is obtained by heating p...
Explanation:
Gypsum and plaster of Paris are two different forms of calcium sulfate with different properties and uses. Here is a detailed explanation of each statement:
Gypsum:
- Gypsum is a naturally occurring mineral composed of calcium sulfate dihydrate (CaSO4·2H2O).
- It is a soft, white or gray mineral that can be found in sedimentary rock formations.
- Gypsum is widely used in construction, agriculture, and industry due to its properties such as fire resistance, sound insulation, and soil conditioning.
- Gypsum is not suitable for casting or molding due to its low setting time and low strength.
Plaster of Paris:
- Plaster of Paris is a form of gypsum that is obtained by heating gypsum at a high temperature to remove its water content.
- The resulting powder can be used for casting, molding, and sculpting due to its ability to harden quickly when mixed with water and its high strength.
- Plaster of Paris is widely used in the medical field for making casts and splints, as well as in art and crafts for creating sculptures and decorations.
Correct Statement:
- Gypsum contains a lower percentage of calcium than plaster of Paris.
- This statement is true because plaster of Paris is a form of gypsum that has been heated to remove its water content, resulting in a higher concentration of calcium sulfate.
- Plaster of Paris typically contains 70-75% calcium sulfate, while gypsum contains only about 50% calcium sulfate.
- This difference in calcium content affects the physical properties and uses of each material, as discussed above.
Conclusion:
In conclusion, the correct statement is that gypsum contains a lower percentage of calcium than plaster of Paris. Understanding the properties and uses of each material can help in selecting the appropriate material for a specific application.
Identify the correct statement [1995]a)gypsum is obtained by heating p...
Gypsum is CaSO4.2H2O
while Ploster of peris is 2CaSO4.H2O
thus Ploster of peris contain greater percentage than gypsum.
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