Ammonium Metatungstate Picture

Difference between ammonium tungstate, ammonium paratungstate and ammonium metatungstate:

Chinese Name 钨酸铵 偏钨酸铵 仲钨酸铵
英文名称 Ammonium Tungstate Ammonium Metatungstate Ammonium Paratungstate
Formula (NH4)10W12O41~xH2O (NH4)6H2W12O40.XH2O 5(NH4)2-12WO3-5H2O
Appearance Colorless Orthorhombic Crystal White or Slightly Yellow Crystalline Powder White Crystal
CAS Number 13472-45-2 14311-52-5 11120-25-5
Solubility (Water) Slightly Soluble Easily Soluble, 303.99/100g(20℃) Slightly Soluble

Ammonium tungstate, ammonium metatungstate and ammonium paratungstate are important intermediates of tungsten metallurgical industry. The figures below are ammonium tungstate, ammonium paratungstate, ammonium metatungstate from left to right.