Question:
The chemical formula of Plaster of Paris is:
The chemical formula of Plaster of Paris is:
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Plaster of Paris is made by heating gypsum (\( \text{CaSO}_4 \cdot 2\text{H}_2\text{O} \)) to remove part of the water content, resulting in \( \text{CaSO}_4 \cdot \text{H}_2\text{O} \).
Updated On: Oct 10, 2025
- \( \text{CaSO}_4 \cdot 3\text{H}_2\text{O} \)
- \( \text{CaSO}_4 \cdot 2\text{H}_2\text{O} \)
- \( \text{CaSO}_4 \cdot \text{H}_2\text{O} \)
- \( \text{CaSO}_4 \cdot \frac{1}{2} \text{H}_2\text{O} \)
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The Correct Option is C
Solution and Explanation
Plaster of Paris is chemically known as calcium sulfate hemihydrate. Its formula is:
\[
\text{CaSO}_4 \cdot \frac{1}{2} \text{H}_2\text{O}
\]
This means that for every molecule of calcium sulfate, half a molecule of water is attached. When Plaster of Paris is mixed with water, it forms a hard solid, making it useful for making casts and molds.
Thus, the correct formula for Plaster of Paris is \( \text{CaSO}_4 \cdot \text{H}_2\text{O} \), which is option (C).
This means that for every molecule of calcium sulfate, half a molecule of water is attached. When Plaster of Paris is mixed with water, it forms a hard solid, making it useful for making casts and molds.
Thus, the correct formula for Plaster of Paris is \( \text{CaSO}_4 \cdot \text{H}_2\text{O} \), which is option (C).
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