A dictionary of chemistry and the allied branches of other sciences Volume 3

9781130713787: A dictionary of chemistry and the allied branches of other sciences Volume 3
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 Excerpt: ...covered with a pellicle, and evaporation is impeded. At a later stage conglomerates of needles are deposited, which, when carefully dried over sulphuric acid in vacuo, appeared a little blackened, like most silver-salts, but are not decomposed. Silver by analysis 26-97 per cent.; the formula requires 29' 1 per cent. (Thudichum.) Leucate of Sodium.--The aqueous acid neutralised with carbonate of sodium, and evaporated, leaves a syrupy residue covered with u crystalline crust. When this syrup is left over oil of vitriol, crystals form in it, which under the microscope exhibit a characteristic tub-shape, with rhombic plates interspersed here and there. Thudichum.) Ltucatc of Zinc, C«H"ZnOs or C"H«ZznO'.--This salt is obtained by neutralising the dilute acid at the boiling heat with carbonate of zinc, and filtering at the same temperature. The solution deposits a thin crust on cooling. Evaporated over the water-bath, it soon becomes covered with a crust, and on cooling deposits bulky masses of needles, which must be separated by filtration, pressed between bibulous paper, and dried by exposure to the air or over the water-bath. The best crystals are obtained from a solution containing excess of leucic acid (Thudichum). For Waage'a mode of preparation, see page 575. The salt is snow-white, with splendid silky lustre; exhibits under the microscope the appearance of masses of needles (Thudichum); extremely light scales, of dazzling whiteness and silky lustre (Waage). It is sparingly soluble even in boiling water, less in cold water (Thudichum); dissolves in 300 pts. water at 16, and ia 204 pts. boiling water, more soluble in alcohol (Waage). The air-dried salt contains 2CH"ZnOJ.H'O or C'zHKZznO«.H!O, and gives off its water (S-l per c...

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