Essentials of Volumetric Analysis; An Introduction to the Subject, Adapted to the Needs of Students of Pharmaceutical Chemistry

Essentials of Volumetric Analysis; An Introduction to the Subject, Adapted to the Needs of Students of Pharmaceutical 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. 1917 edition. Excerpt: ...to not more than 0.2 gm. of HN03. The stopper is then reinserted, heat applied, and gradually increased until the reaction is complete. The free hydrochloric acid liberates nitric acid from the nitrate and oxidation of a portion of the iron is effected. The ferrous chlorid is oxidized to ferric chlorid, as the equation shows, and the solution becomes at first dark brown through the presence of N0. As the heat is increased, the dark-brown color of the solution is gradually changed to yellow, as ferric chlorid is formed, and increases in intensity until the reaction is complete, then the color remains stationary and indicates completion of oxidation. The solution is now allowed to cool, but the stream of C02 or H gas is maintained. Forty mils of a solution of manganese sulphate are now added (this is not necessary if sulphuric acid is used instead of hydrochloric), Or fine piano-forte wire.... N and titration with--potassium permanganate solution begun, in order to determine the quantity of unaltered ferrous salt remaining in the solution. Assuming that 89 mils were required, the calculation is made as follows: Since one molecule of HN03 (63.01) reacts with three atoms of iron (167.46) the quantity of iron found to have 63.01 been oxidized, if multiplied by yg, wm give the quantity of nitric acid present. Example. 1.5 gms. of iron wire, 99.6 per cent Fe= (1.494 gms. of iron), is dissolved in hydrochloric acid, as above described, and 0.6 gm. of potassium nitrate, KN03 (101.11), added. After oxidation, 98 mils of decinormal permanganate were N required. Each mil of--KMn04 = 0.005582 gm. of Fe. 0.005582 gm. X 98=0.547 gm. of oxidized iron. 1.494 gms. of iron were originally taken. Therefore, Assay of Chlorates. The chlorate is made to react with a...show more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236593154
  • 9781236593153