Both gypsum and plaster of Paris contain the same compound, but in different stages of hydration. That compound is: A) BaSO₄ B) BaCO₃ C) CaSO₄ D) CaCO₃ E) KAl(SO₄)₂

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Quizplus · Accepted Answer

The compound in question is CaSO4, or calcium sulfate. Gypsum and plaster of Paris are both forms of calcium sulfate, but they differ in their degrees of hydration. Gypsum is hydrated calcium sulfate (CaSO4·2H2O) while plaster of Paris is hemihydrate calcium sulfate (CaSO4·1/2H2O). Therefore, the only option that contains calcium sulfate is C.

Both Gypsum and Plaster of Paris Contain the Same Compound