Sodium heptatungstate heptatungstate hexadecahydrate is sodium paratungstate, also known as sodium heptatungstate heptatungstate hexadecahydrate, chemical formula Na6W7O24·16H2O, molecular weight 2097.12, relative density 3.987. Sodium heptatungstate heptatungstate hexadecahydrate is a colorless triclinic crystal. When heated to 100°C, it loses 12 molecules of crystal water, and loses 16 molecules of crystal water at 300°C, becoming anhydrous. Sodium heptatungstate hexadecahydrate is soluble in cold water and decomposed in hot water.
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