A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . 90. As we have already had occasion to remark, the soda ash of commerce frequentlycontains some, and occasionally a large quantity of caustic soda, the proportion of which isat times important to determine. This may be done, according to Mr. Barreswill, byadding a solution of chloride of barium to the aqueous solution of the soda ash, by whichthe carbonate of soda is converted into carbonate of barytes, whil.«t the caustic soda, react-ing upon the chloride of ba
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . 90. As we have already had occasion to remark, the soda ash of commerce frequentlycontains some, and occasionally a large quantity of caustic soda, the proportion of which isat times important to determine. This may be done, according to Mr. Barreswill, byadding a solution of chloride of barium to the aqueous solution of the soda ash, by whichthe carbonate of soda is converted into carbonate of barytes, whil.«t the caustic soda, react-ing upon the chloride of barium, liberates a quantity of caustic barytes proportionate to thatof the caustic soda in the soda After this addition of chloride of barium, the liquor isfiltered in order to separate the precipitated carbonate of barytes produced, and which re-mains on the filter, on whieh it should be washed with pure water. A few lumps of chalkarc then put into a Florence flask, a, and some muriatic acid being poured upon it, aneffervescence due to a disengagement of carbonic acid is produced, the flask is then closed ALKALIMETRY. 57. with a good cork, provided with a bent tube, 6, reaching to the bottom of the vessel, <?, andthe stream of carbonic acid produced is then passed through the liquor, c, filtered from thecarbonate of barytes above mentioned. The stream of car-bonic acid produces a precipitate of carbonate of barytes,which should be also collected on a separate filter, washed,dried, and weighed. Each gain of this second precipitate ofcarbonate of barytes corresponds to 0-3157 of caustic soda. 91. As the soda ash of commerce almost invariably con-tains earthy ciu-bonates, the sample operated upon shouldalways be dissolved in hot water, and filtered, in order toseparate the carbonate of lime, which otherwise would saturatea proportionate quantity of the test acid, and thus render theanalysis worthless. 92. The quantity of water contained in either potash orsoda ash is asc
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