General Science • ChemistryEasy
What is the common name of calcium sulfate hemihydrate?
A. Plaster of Paris✓ Correct Answer
B. Gypsum
C. Baking Soda
D. Bleaching Powder
💡 Solution & Explanation
Plaster of Paris has the chemical formula of calcium sulfate hemihydrate, formed by heating gypsum to a specific elevated temperature until it loses three-fourths of its water of crystallization. Gypsum itself is the dihydrate form, whereas baking soda and bleaching powder correspond to completely different chemical compounds. This material sets into a hard solid mass when mixed with water, making it valuable for medical casts and statues.
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