An Elementary Text-Book of Chemistry

An Elementary Text-Book 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. 1897 edition. Excerpt: ...where insensibility for a brief period only is required. When a mixture of air or oxygen and nitrous oxide is breathed for a short time a nervous excitement, often accompanied by laughter, is produced, and without loss of consciousness. Hence the name laughing-gas has been given to nitrous oxide. When the gas is to be inhaled it should be perfectly pure, and free from chlorine and nitric oxide. Nitrous oxide is prepared by heating ammonium nitrate, part of the salt being decomposed thus: O5N-O-NH4 = N-O-N + 2H3O. At the same time a portion dissociates into nitric acid and ammonia, which unite in the cooler part of the apparatus to form ammonium nitrate again: NO3-O-NH4 = NO3-OH + NH3. When ammonium nitrate is heated too rapidly it decomposes with explosive violence and formation of other products. Nitrous oxide is freed from nitric oxide by contact with a solution of ferrous sulphate, and from acid fumes by potassium hydroxide. Exp. 164.--The flask A, Fig. 82, has a capacity of about 200 cc. Place in it the ammonium nitrate of Exp. 160, and in B a piece of red litmus paper. Heat A cautiously, so as to avoid too rapid evolution of gas, and collect the gas over water. Observe that the test paper in B at first turns blue and later becomes red. Why? Do not decompose quite all the salt in A, and when through heating, remove the delivery-tube from the water. The bottle B will contain water and ammonium nitrate. The presence of the latter may be made evident by evaporating the solution cautiously. Exp. 165.--a. Thrust a glowing splinter into nitrous oxide. b. Introduce into the gas on a chalk spoon a bit of sulphur burning feebly. c. By means of a lamp flame heat the sul- J r.. Fig. 83. phur so that it will burn in the air very rapidly, ...
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Product details

  • Paperback | 134 pages
  • 189 x 246 x 7mm | 254g
  • United States
  • English
  • black & white illustrations
  • 1236502949
  • 9781236502940