. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. sphorus bromide (PBr5) are at onceformed. These in the presence of water immediately yield hydriodicand hydrobromic acids (HI, HBr) and phosphoric acid. The nitricacid attacks the hydriodic and hydrobromic acids, forming the loweroxides of nitrogen, which escape as gas, water, and free iodine andbromine. The latter unite with more phosphorus, and the reactionsare repeated. This carrying power of
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. sphorus bromide (PBr5) are at onceformed. These in the presence of water immediately yield hydriodicand hydrobromic acids (HI, HBr) and phosphoric acid. The nitricacid attacks the hydriodic and hydrobromic acids, forming the loweroxides of nitrogen, which escape as gas, water, and free iodine andbromine. The latter unite with more phosphorus, and the reactionsare repeated. This carrying power of a little iodine or bromine orboth would perhaps be indefinitely prolonged if no vapor of theseelements or their acids escaped with the gases. The phosphorushaving disappeared, excess of nitric acid is got rid of roughly bydropping in clean rags or paper (nitric oxide, carbonic acid gas, andwater being formed), and the last portions by adding oxalic acid(which even still more readily yields similar products). Evapora-tion to a syrupy consistence finally removes all traces of iodine,bromine, oxalic acid, and moisture. The product is then diluted toany required extent. 330 THE ACIDULOUS Experimental Process.—A flask, in the neck of which a funnel isinserted and a second funnel inverted, soFig. 40. that its mouth rests within the mouth of the first, is an efficient and convenient ar-rangement of apparatus for the officialprocess, especially if the operation be con-ducted slowly. (See Fig. 40.) Solution of phosphoric acid evaporatedto a sp. gr. of yields a mass of pris-matic crystals of H3P04, especially if acrystal or two be dropped into the fluid(Cooper). Further evaporated, it leaves aresidue which melts at a low red heat,yielding pyrophosphoric acid, and, finally,metaphosphoric acid (Glacial PhosphoricAcid). A commercial variety of phosphoric acid,containing no large amount of impurity,is prepared by well digesting a mixture ofbone-ash, sulphuric acid, and wat
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