Model plaster (white) used to cast study models before mixing with water, is largely composed of____________?
Correct answer: A. (CaSO4)2-½H2O
- A. (CaSO4)2-½H2O
- B. CaCO3
- C. CaO
- D. CaSO4-2H2O
Explanation
Before mixing with water, model plaster consists mainly of calcium sulphate hemihydrate, written as CaSO4·½H2O. Calcium sulphate dihydrate is formed only after the setting reaction.
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