Memoranda to Accompany the Naval Test Case and Microscopical Outfit, 1914

Memoranda to Accompany the Naval Test Case and Microscopical Outfit, 1914

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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. 1914 edition. Excerpt: ...water. The solution is allowed to cool and filtered and the crystals of silver nitrite now on the filter are dried. Weigh out 0.275 gram of the silver nitrite, dissolve in a little hot water and add to it about 0.2 gram of sodium chloride and then water enough to make 250 c. c.; mix and allow to stand in the dark until clear. Dilute 10 c. c. of clear solution to 100 c. c. with water; each c. c. of the latter solution of sodium nitrite will contain 0.00001 gram nitro en as nitrite. To 50 c. c. of the water under examination, containe in " _a Nessler jar add 2 c. c. each of sulphanilic acid and naphthylamine and mix by means Z At the same time dilute 1 c. c."o the standard sodium After a lapse of half an hour these solutions are If it has become pink or red, nitrites are present. To determine the quantity, compare the color with that produced in the tube containing the 1 c. c. of standard nitrite. If the color is darker than the standard, which will not often be the case, repeat the whole experiment--that is, with both standard and water--but instead of 50 c. c. use a smaller but known quantity of water diluted to 50 c. c. Then into a third Nessler jar pour from the tube containing the 1 c. c. of standard just sufiicient of the mixture to match the color produced in the sam le and note the volume required; this volume when multiplied y 0.0000002 (for each c. c. of solution in the tube containing the 1 c. c. of standard contains this quantity of N as nitrite) will give the quantity of N as nitrite in the quantity of water tested. The parts per 1,000,000 can be readily calculated from this. EXAMPLE The color produced in 50 c. c. of water was exactly matched by 15 c. c. of the solution from the tube containing the standard. Then...show more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236988744
  • 9781236988744