Year-Book of Pharmacy

Year-Book of Pharmacy

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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. 1880 edition. Excerpt: ...with difficulty. If, however, the solution is poured into cold water in a very thin stream, a very voluminous mass results (25 grams occupy the space of 2 litres), which may be easily washed. On drying, the mass becomes horny, semi-transparent, and amber-coloured. It is easily soluble in ether-alcohol. Glacial Acetic Acid is also a good solvent of gun-cotton. The solution poured into water behaves like that made with acetone. On drying, every trace of acetic acid volatilizes. Ultramarine. A. Rinne. (Ber. der deutsch. client. Ges., xii., 1323-1326. From Journ. Ghent. Soc.) In tbe preparation of ultramarine, the product obtained from the same mixture of ingredients may vary in colour from green to deep blue. If the different samples are washed with water, and the amount of sodium sulphate determined in the liquid, it will be found that the sodium sulphate increases with the intensity of the blue: e.g. from green ultramarine, 2'41 per cent. Na.3 So4, and from blue ultramarine, 6-87 per cent. Na.3 So4--were obtained. The amount of sulphuretted hydrogen evolved when tbe ultramarine is treated witb an acid is less for blue than for green ultramarine; green = l-96, blue 0"22 per cent. S. Since ultramarine contains sodium thiosulphate and sulphite, these numbers do not prove that the blue ultramarine contains but a very small quantity of sodium sulphide; they merely indicate that the sulphuretted hydrogen evolved from the decomposition of the sodium sulphide is almost completely destroyed by the sulphurous anhydride which is liberated from the sulphur oxy-acids. The author regards ultramarine as a sodium-aluminium silicate, in which varying quantities of sodium sulphide and the sodium salts of sulphur oxy-acids are dissolved. Examination of more

Product details

  • Paperback | 268 pages
  • 189 x 246 x 14mm | 485g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236655524
  • 9781236655523