What Are the Important Physical Properties of Ammonium Paratungstate? 2023-02-23 Tungsten Oxide 173 The molecular weight of ammonium paratungstate is 568.19, the melting point is 220-225 ℃, and the density is 3.16 g/cm3. It is soluble in water, but insoluble in ethanol and acetic acid. 0 0 ammonium paratungstateimportant physical properties