Yellow tungstic acid is a common tungstic acid, referred to as tungstic acid, which is light orange-yellow powder; its composition varies slightly with different preparation conditions. When the composition is WO3•H2O, the density is 5.5 g/cm3, and it is dehydrated at 100 °C ; Insoluble in water, gradually gelled after dipping, soluble in ammonia water, alkaline solution and concentrated hydrochloric acid. Yellow tungstic acid is dehydrated by burning to produce tungsten trioxide WO3, which is a bright light yellow crystal or powder with a density of 7.16 g/cm3 and a melting point of 1473°C. Yellow tungstic acid is prepared by acidifying sodium tungstate Na2WO4•2H2O solution with hydrochloric acid to become sodium polytungstate solution, and then adding excess concentrated hydrochloric acid to the hot solution. The yellow tungstic acid prepared by this method contains sodium impurities, and has been changed to ion exchange and solvent extraction.
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