Exercises in Practical Chemistry; Elementary Exercises Volume 1

Exercises in Practical Chemistry; Elementary Exercises Volume 1

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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. 1869 edition. Excerpt: ...neck of the flask in rhombic plates, the form of which may be readily made out with a small magnifying glass. Very fine crystals of iodine are often formed, by spontaneous sublimation on the stopper of a bottle containing it. 2. Put a small piece of carefully dried phosphorus into an evaporating dish and place on it a crystal or two of iodine. In a few moments the two bodies will combine, and will inflame from the heat produced by their union. 3. Pour a little of a solution of potassium iodide into a test-tube and add a crystal or two of iodine, which will readily dissolve forming an orange-red liquid. Pour the solution into a test-glass or beaker, and dilute it with about 200 c.c. of water. 1 If carbon disulphide is not at hand, ether will serve the purpose as it will form a coloured stratum on the top of the aqueous solution. Add to it a little freshly made solution of starch, and stir with a glass rod. A deep blue colour will be formed even in so highly dilute a solution of iodine; a reaction which is very delicate and characteristic. Pour a little of the blue solution into a test-tube, and heat it nearly to boiling. The blue colour will disappear, but will again become apparent when the solution cools. Hence in testing for iodine by this method care must be taken that the liquid is cold. The starch solution, moreover, must be freshly made; since after a time it loses the property of forming a blue compound with iodine, probably owing to its conversion into dextrine. 4. Place a few crystals of iodine in a test-tube, pour over them about 5 or 6 c.c. of water, and shake the mixture. You will find that iodine is scarcely soluble in cold water, but enough will dissolve to colour the liquid pale yellow, and to give the deep blue colour when poured...show more

Product details

  • Paperback | 100 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236616049
  • 9781236616043