Proceedings of the American Academy of Arts and Sciences Volume 44

Proceedings of the American Academy of Arts and Sciences Volume 44

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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. 1909 edition. Excerpt: ...quantity is applied as a correction in every case. In place of a platinum boat a superficially oxidized copper boat was used in these experiments. At the low temperature of fusion of silver dichromate there is little danger of decomposition of nitric acid or oxides of nitrogen by the oxidized copper. It is to be noted that if the nitric acid is decomposed during the experiment according to the following equation: 2HNO, = H,0 + 2NOa + 0, and is absorbed by the potassium hydroxide as NOa, there is a slight loss of oxygen. The proportion of nitric acid present being very small, however, this error could have no appreciable effect on the results. It is somewhat surprising that Samples I and II contain the same proportion of volatile matter. This agrees with the result of the silver determinations, however, the samples proving to be otherwise very similar. As is to be expected, Sample III contains less impurity than either of the other two. The negative corrections as found above are applied to all the final weights of silver dichromate given in the table of analyses. The Specific Gravity Of Silver Dichromate. The specific gravity of silver dichromate has been found by Schroder 7 to be 4.669, but on account of the uncertainty of most of the older specific gravity determinations this constant was very kindly redetermined for us by Mr. Victor Cobb. The silver dichromate was precipitated from dilute nitric acid solution and once recrystallized from normal nitric acid. Then it was dried at 200 for many hours. The determination was effected by displacement of toluol of specific gravity 0.86218. Care was taken to extract entangled air from the crystals by exhausting the air from the pycnometer in a vacuum desiccator. A No. 10 Troemner balance more

Product details

  • Paperback
  • 189 x 246 x 12mm | 413g
  • United States
  • English
  • black & white illustrations
  • 1236949145
  • 9781236949141