What Are Physical Properties of Ammonium Paratungstate? 2023-02-24 Tungsten Oxide 173 The melting point of ammonium paratungstate is 253 ℃, and the density is 3.24 g/cm ³, Soluble in water and methanol, insoluble in organic solvents such as ethanol and ether. 0 0 ammonium paratungstatephysical properties