Manual of chemical analysis as applied to the examination of medicinal chemicals : a guide for the determination of their identity and quality, and for the determination of their identity and quality, and for the detection of impurities and adulterations : for the use of pharmaceutists, physicians, druggists, and manufacturing chemists, and of pharmaceutical and medical students . drachms ofthe concentrated acid, and then adding, drop by drop, aboutone fluid-drachm of concentrated sulphuric acid; the mixturebecomes hot, but remains clear and colorless; if, however,traces of arsenic are contain
Manual of chemical analysis as applied to the examination of medicinal chemicals : a guide for the determination of their identity and quality, and for the determination of their identity and quality, and for the detection of impurities and adulterations : for the use of pharmaceutists, physicians, druggists, and manufacturing chemists, and of pharmaceutical and medical students . drachms ofthe concentrated acid, and then adding, drop by drop, aboutone fluid-drachm of concentrated sulphuric acid; the mixturebecomes hot, but remains clear and colorless; if, however,traces of arsenic are contained in the acid, it becomes more orless turbid, and deposits a brown precipitate. Another test is to introduce a mixture of one fluid-drachmof the acid, with four drachms of water wherein about threegrains of cupric sulphate have been dissolved, into a long test-tube (Fig. 32), taking care that the liquid fills only about one-tenth of the tube, and that the upper interior surfaces ofthe tube remain dry ; a few pieces of pure zinc are thenadded, and a small bunch of gun-cotton moistened with solu-tion of argentic nitrate, or a cork provided with a strip ofstrong white blotting-paper moistened with the argentic solu- 86 MANUAL OF CHEMICAL ANALYSIS. tion, is inserted into the orifice of the tube, which is then al-lowed to stand, protected from the solar light, for half Fro. 82. A dark coloration of the solution of argentic nitrate, notdisappearing when immersed in a warm dilute solution ofpotassium cyanide, confirms the presence of arsenic. ACIDA. 87 TABLE OF THE QUANTITY BT WEIGHT OF HYDEOCHLOEIC-ACID GAS CONTAINED IN100 PAKTS BY WEIGHT OF AQUEOUS HYDKOCHLOEIC ACID AT DIFFEEENTDENSITIES. Tempebatube 16 C. o >> o . o >» CM o . ^1 « >> «i-rO . O >t (»0 PercenHydroAcid. PercenHydroAcid. PercerHydroAcid. PerceiHydro Acid. 41 31 21
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Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
