If Gypsum () is heated strongly to temperatures exceeding (e.g., ), it forms a product known as "dead burnt plaster". What is the chemical formula of dead burnt plaster?

Question

If Gypsum ($CaSO_4 \cdot 2H_2O$) is heated strongly to temperatures exceeding $393	ext{ K}$ (e.g., $473	ext{ K}$), it forms a product known as "dead burnt plaster". What is the chemical formula of dead burnt plaster?

Prashant Kotian · Accepted Answer

Correct answer: B. Heating above drives off all the water of crystallization, leaving completely anhydrous Calcium Sulphate (). It is called "dead" because it permanently loses its ability to form a plastic mass and set hard when mixed with water.

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