Abstract
For indirect volumetric analysis of sulfate the general method of adding a definite excess of barium ion against the sulfate has been used for formation of the precipitate of barium sulfate, then the remaining barium ion is estimated by use of various reagents;in this connection, the writersinvestigated a new method of using sodium palmitate as a quantitative reagent. The method is to adda definite excessive amount of sodium palmitate against the residual barium ion, the precipitate of barium palmitate thus formed is aged in alcohol as a solvent, the precipitate is filtered, an equalvolume of benzene is added to the filtrate and the remaining sodium palmitate is determined by titration with a standard acid solution for-an indirect estimation of sulfate. The end point of titration can be determined by potentiometric titration with the use of antimony electrode or 2, 4, -or 2, 6, m-dinitrophenol as an indicator. A microdetermination of 110 mg SO--4is possible by use of this method.
