A Manual of Chemistry

A Manual of Chemistry

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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. 1829 edition. Excerpt: ...Europe, the streams of Hungary and Transylvania have afforded a respectable quantity of gold; it has been found also in the Rhine, the Rhone, and the Danube. Small quantities have been collected in Cornwall, and in the county of Wicklow in Ireland. 1276. Gold may be obtained pure by dissolving standard gold inM-icofobnitro-muriatic acid, evaporating the solution to dryness, re-dissolving" the dry mass in distilled water, filtering, and adding to it a solution of protosulphate of iron; a black powder falls, which, after having been washed with dilute muriatic acid and distilled water, affords on fusion a button of pure gold. 1277. Gold is of a deep yellow colour. It melts at a bright red heat, and when in fusion appears of a brilliant green colour. Gold is so malleable that it may be extended into leaves which do chwicim. not exceed? J 0 0 of an inch in thickness, it is also very ductile. It shows no tendency to unite to oxygen when exposed to its action in a state of fusion; but if an electric discharge be passed through a very fine wire of gold, a purple powder is produced, which has been considered as an oxide. 1278. Oxide of Gold may be obtained by adding a solution of potassa to solution of muriate of gold, and heating the mixture; the precipitate must be washed first with weak solution of potassa, and then with water, and dried at a temperature of 100o; if the heat exceed this, a portion of the oxide is reduced., and it is then only partially soluble in muriatic acid. If this be regarded as a protoxide, that is, as consisting of 1 proportional of gold + 1 of oxygen, then the number 103.4 + 7.6: 97:: 8: 103.4 will represent gold, and this oxide will consist of 103.4 gold-f-8 oxygen = 111.4. It is, however, probable that the purple...show more

Product details

  • Paperback | 262 pages
  • 189 x 246 x 14mm | 472g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236623835
  • 9781236623836