TITANIUM (III) SULFATE

Titanium tetrachloride (100 g.) is carefully decomposed with approximately four times its volume of H2O. The solution is cooled and treated with dilute ammonia to precipitate TiO2 aq, which is suction-filtered, thoroughly washed with water, and dissolved (vigorous shaking) in 70 ml of cone. H2SO4. The solution is diluted with water to one liter, the precipitation with ammonia is repeated, and the resultant deposit is reprecipitated two additional times. The TiO2 aq obtained (about 480 g.) is carefully dissolved in 100 ml. of cone. H2SO4, yielding a total liquid volume of about 500 ml; this is suction-filtered through glass and treated with 300 ml. of cone. H2SO2, yielding about 400 ml. of a solution of Ti (TV) sulfate. This solution is reduced to titanium (III) sulfate by electrolytic method.