The Chemistry of the Most Important Elements and Compounds

The Chemistry of the Most Important Elements and Compounds

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ... make the carbonate by electricity? M. Certainly, all we require to do is to pass in carbon dioxide near the cathode during the preparation of the sodium hydrate, which then changes into the carbonate. VVrite the equation. P. NaOH+CO2--no, that won't do. I must take two sodium hydrate. M. As it happens, you were about to write the correct equation. It should read: NaOH+CO2=NaHCO3. We obtain, not the neutral, but the acid carbonate. P. Ah; I understand. Carbonic acid is dibasic, and can therefore have two sodium salts; the neutral, Na2CO3, and the acid, NaHCO3. Why is the latter formed in this case? M. It is very much less soluble than the neutral salt, and so separates out from the solution, no evaporation being necessary. I have here a concentrated solution of soda crystals; I pass in some carbon dioxide from our old apparatus (I. p. 238); the following reaction takes place: P. Why did you insert water? M. Since carbon dioxide is an anhydride, water is necessary for the preparation of its acid.. P. A quantity of crystals has formed! M. This new salt, the acid-sodium carbonate or sodiumhydrogen carbonate, is probably already known to you. It is also called sodium bicarbonate, because it contains twice as much carbonic acid as the neutral salt. It is taken as a remedy for simple stomachic troubles. P. Yes; I know it well. But why is so much of the crystalline soda made? M. Because it is used for many purposes in industrial chemistry. It and sulphuric acid are to the chemical manufacturer what iron is to the engineer. P. I realize that sulphuric acid should be so because it has strong acidic properties. But what use do they make of sodium carbonate? M. It can be employed in many cases instead of caustic soda; for since carbonic more

Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • United States
  • English
  • black & white illustrations
  • 1236956761
  • 9781236956767