Setting of POP is result of______________?
Correct answer: D. Difference in solubility of CaSo4 ½ H2O + CaSO4+ 2H2O
- A. Reaction between hemihydrate and hihydrate
- B. Reaction between CaSO4+ 2H2O and water
- C. Nucleation and growth of CaSo4 ½ H2O crystals
- D. Difference in solubility of CaSo4 ½ H2O + CaSO4+ 2H2O
Explanation
Gypsum sets because the more soluble hemihydrate dissolves and the less soluble dihydrate precipitates as crystals. This solubility difference drives the reaction, rather than a simple reaction between two already hydrated forms.
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