A Course of Practical Chemistry Arranged for the Use of Medical Students

A Course of Practical Chemistry Arranged for the Use of Medical Students

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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. 1876 edition. Excerpt: ...when brought into contact with the vapour of hydrochloric acid. This test is applicable in the presence of any number of fixed bases. I. All ammoniacal salts volatilise partly, most of them entirely, when heated upon platinum foil or charcoal. XI.--REACTIONS OF INDIVIDUAL ACIDS. (89.) Chromates. Chromates are usually of a yellow or red colour, and, except those of the alkali metals, are more or less insoluble in water. a. Chromates acidified with hydrochloric acid, and treated with sulphuretted hydrogen, yield a whitish deposit of sulphur, and a green solution of chromic chloride, CrCl3 or Cr, C16. The same compound is formed on boiling the solution of a chromate with hydrochloric acid and a little alcohol. To it, the ordinary tests for chrome salts can be applied. (3. Nitrate of silver gives a dark red precipitate of chromate of silver Ag, CrO4, soluble in nitric acid. Nitrate of barium and acetate of lead throw down yellow precipitates of the chromates of the respective metals. (90). Nitrates. The nitrates are soluble or non-precipitable salts, which deflagrate when ignited upon charcoal or with organic matter. a. When a nitrate, or the concentrated solution of a nitrate, is gently heated with sulphuric acid and a few copper turnings, brown fumes of peroxide of nitrogen NO, are evolved, which NITRATES CHLORATES. 145 redden, but do not bleach, litmus paper, and produce a purple colouration on starch paper moistened with iodide of potassium. /3. A solution of protosulphate of iron carefully poured upon sulphuric acid, to which a minute portion of a solid or dissolved nitrate has been added, produces a deep brown halo at the junction of the two liquids, as seen in fig. 36. y. When a minute quantity of gold-leaf is boiled in hydrochloric...show more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236509013
  • 9781236509017