American journal of pharmacy . ch is disengaged in its gaseous state. Our method, based as we have said, on this property ofsubstances containing nitrogen, not at all, or only in smallpart, under the form of nitric acid, consists in collectingcompletely this ammonia by the aid of some acid, and toweigh it in the solid form, as hydrochlorate of ammonia andplatinum. We use, for the accomplishment of this purpose, an appara-tus consisting of a tube of slightly fusible glass, from Om,433to Om,487 in length (16 to 20 inches) such as is usuallyemployed in ordinary combustions to determine
American journal of pharmacy . ch is disengaged in its gaseous state. Our method, based as we have said, on this property ofsubstances containing nitrogen, not at all, or only in smallpart, under the form of nitric acid, consists in collectingcompletely this ammonia by the aid of some acid, and toweigh it in the solid form, as hydrochlorate of ammonia andplatinum. We use, for the accomplishment of this purpose, an appara-tus consisting of a tube of slightly fusible glass, from Om,433to Om,487 in length (16 to 20 inches) such as is usuallyemployed in ordinary combustions to determine tube is drawn out at its end into a point, turned upobliquely and sealed, the other extremity is fused on theedges. It differs from the ordinary tube of combustion onlyin its diameter being much less, say about Om,0067 (quarter 144 DETERMINATION OF NITROGEN. of an inch) in diameter. To the open extremity there is tobe adjusted hermetically, by means of pierced cork, whichneed not be dried, an apparatus of the following form,. containing; hydrochloric acid for the absorption of the am-monia. The form of this apparatus differs but little from thepotassa apparatus of Liebig: this latter doubtless fulfils itsobject, absorption ; but its construction renders it difficult towash completely, a necessary condition after each form of apparatus which we have chosen answers well,without rendering the absorption less complete ; as the ab-sorption of ammonia by the acid is much more rapid thanthat of carbonic acid by potassa, it is useless, in the determina-tion of nitrogen, to multiply the points of contact of the gasand liquid, as is done so ingeniously in the potassa ap-paratus. The apparatus is filled by plunging the point in hydro-chloric acid of ordinary strength, (sp. gr. ) and inspiringthe air from d, until the liquid assumes the height indicatedin the figure. We use, as the means of decomposing the organic matterscontaining nitrogen, for the purpose of oxidizin
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Keywords: ., bookcentury1800, bookdecade183, booksubjectpharmacy, bookyear1835
