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 . ted, and the whole apparatusquickly weiglied or counterpoised;the flask B is charged with a lit-tle concentrated sulphuric acid,through wliich the evolved car-bonic-acid gas has to pass, andwhich absorbs and retains
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 . ted, and the whole apparatusquickly weiglied or counterpoised;the flask B is charged with a lit-tle concentrated sulphuric acid,through wliich the evolved car-bonic-acid gas has to pass, andwhich absorbs and retains themoisture; gentle heat is appliedto the flask A, as long as a briskevolution of gas takes place; theprocess is completed when this ac-tion and the passage of gas-bub-bles through the sulphuric acidboth cease, and the black color of the mixture has changed toa more or less brown one; the residual gas is then driven off,by momentary ebullition, and the apparatus weighed. Everytwo molecules of carbonic acid evolved correspond to one mole-cule of manganese dioxide decomposed ; the molecular weightof the latter (87) being so nearly equal to twice that of carbonicacid (44), that the loss of weight suffered by the apparatus maybe taken to i^epresent the quantity of real manganese dioxidein 50 grains of the sample; and it has only to be doubled inorder to express the Fig. T6. MANGANESII SULPHURICUM. Sulphate of Manganese. Manganous Sulphate. Colorless or pale rose-colored prismatic crystals, occurringin three different forms, with different quantities of water ofcrystallization : (1.) Oblique-rhombic prisms (isomorphous withferrous sulphate), containing seven molecules of water of crys-tallization, and obtained when crystallized at a temperature MANGANESIUM. 265 below 6° C.; (2.) Ehomboidal prisms (isomorphous with cupricsulphate), containing five molecules of water of crystallization,obtained when crystallized at a temperature between 7° and20° C.; a
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Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
