Answer
The dodecahydrate melts at 92–95 °C (198–203 °F) in its own water of crystallisation; it loses water on further heating and the anhydrous salt decomposes near 200 °C. Molar mass: 258.19 g/mol anhydrous, 474.37 g/mol dodecahydrate; density 1.725 g/cm³.
Detailed question
What is the melting point of potassium alum?
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