Chemical Analysis of Bromine Trifluoride

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The chemical analysis of bromine trifluoride (BrF3) was studied with the view to establishing a method for determining the purity of this substance, as attained by vacuum distillation. The sample bromine trifluoride was hydrolyzed in NaOH solution. The fluorine in the bromine trifluoride was converted to fluoride (F-) by the hydrolysis, and could thus be determined by thorium nitrate titration(1). The bromine in the bromine trifluoride was converted to bromide (Br-), hypobromite (BrO-) and bromate (BrO-3), and was determined by the Mohr method, after reducing the BrO- and BrO-3 to Br- with hydrazine hydrate (H2NNH2•H2O). A value of 2.97±0.03 wes obtained as ratio of fluorine to bromine for purified bromine trifluoride, and 2.84 for unpurified bromine trifluoride. Prior to analyzing the sample bromine trifluoride the conditions for reducing BrO-3 to Br-by hydrazine hydrate were studied, using KBrO3 solution as sample. It was found that the alkalinity of the sample solution and the reduction temperature had considerable influence on the reduction.