A Course of Practical Chemistry for Agricultural Students Volume 1

A Course of Practical Chemistry for Agricultural Students Volume 1

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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. 1920 edition. Excerpt: ...sulphate is the only ammonium salt used as a manure and is soluble in water, so that a water solution would also give ammonia on boiling with soda. Organic nitrogen is insoluble in water as a general rule. Notef. Superphosphate and dissolved bones are the only manures containing a water-soluble phosphate. All the others contain phosphatic salts which are insoluble in water. They are dissolved by hydrochloric acid, but come down in the iron group directly the solution is made alkaline. For this reason it is more convenient to take phosphates in the table of bases. XXI ANALYSIS OF PLANTS AND PLANT ASH 1. Test several samples of dry plant substance, as for instance oatmeal, wheat flour, ground hay, pea meal and bean meal, for nitrogen by mixing each of them with soda lime and heating in a dry te3t-tube. The presence of nitrogen is shown by the evolution of ammonia, NH3, which can be identified by its smell or, with more certainty, by showing that a bit of red litmus, held in the fumes given off from the tube, turns blue. (See note a.) 2. Make a qualitative analysis of plant ash by the tables already given to you on pages 103 to 105. (See note 6.) NOTES Note a. The greatest part of the nitrogen in the plant substance is present in combination with carbon, hydrogen, oxygen and other elements to form complicated organic substances known as proteins. These bodies are entirely decomposed by heating with dry soda lime and the nitrogen is given off, in combination with hydrogen, as ammonia, NH3. If litmus paper is used in this experiment, it must only come in contact with the gas evolved in the tube and not with any particles of soda lime which may be adhering to the sides of the tube, since soda lime itself is alkaline and would affect the litmus...show more

Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236787099
  • 9781236787095