The Chemistry of Medicines, Practical

The Chemistry of Medicines, Practical

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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. 1883 edition. Excerpt: ...of this nature could be detected by testing with soluiiun of calcium chloride for oxalic acid, 2, white precipitate identifying thatcovnpound.Sulphate of zinc will give a precipitate with sulphide of ammonium or with ferrocyanide of iron and sulphate of magnesium will not. follows the addition of the ammonium carbonate, the precipitate (likely barium or calcium) is to be separated by filtration, and the filtrate tested with sodium phosphate. This test is characteristic of magnesium.. ZINC. Symbol, Zn. Atomic weight, 64.9. Zinc has been indirectly known since the earliest days, as a substance that modified the appearance of copper, brass being the form produced through its agency. Basil Valentine first used the term (zinken). Zinc was once conlbunded with bismuth. The metal occurs in many localities in ores of various compositions, and is purified in large amounts and employed both in the arts and in medicine. Formerly calamine (an impure iorm of zinc ore, ZIICO3) was the only ore worked, but at present many others are employed in this country and in Europe. Zinc is a blueish-white metal, melts at 433 C. and boils at 1040 C. The specific gravity is 6.9. It may be powdered at a. temperature of about 205 C., but is malleable at between 100 and 150 C. (212 and 802 The pure metal is scarcely aflected by dilute sulphuric acid, but the addition of a few drops of solution of chloride of platinum causes immediate action, explained by the fact that the chlorine of the platinum salt unites with the zine to form chloride of zinc, and the platinum is thus deposited upon the surface of the zinc, and induces a galvanic eurrent. Commercial zinc is very impure. It contains in varying proportions lead, silver, cadmium, iron, arsenic, and even other metals, and...
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Product details

  • Paperback | 142 pages
  • 189 x 246 x 8mm | 268g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123661125X
  • 9781236611253