Essentials of Chemistry

Overview

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. 1902 Excerpt: ...acid and hydrobromic acid. The equations are,--(1) 2P+3Br2 = 2PBr3; (2) PBr3 + 3 H20 = H3P03 + 3 HBr. The phosphorous acid, being non-volatile, remains behind; while the gaseous hydrobromic acid passes off. The hydrobromic acid may be freed from bromine vapor by passing it through a U-tube containing moist ...
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Overview

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. 1902 Excerpt: ...acid and hydrobromic acid. The equations are,--(1) 2P+3Br2 = 2PBr3; (2) PBr3 + 3 H20 = H3P03 + 3 HBr. The phosphorous acid, being non-volatile, remains behind; while the gaseous hydrobromic acid passes off. The hydrobromic acid may be freed from bromine vapor by passing it through a U-tube containing moist red phosphorus. 272. Properties of Hydrobromic Acid.--Hydrobromic acid gas is like hydrochloric acid gas. It fumes in the air and dissolves readily in water. Its concentrated aqueous solution has a specific gravity of almost 1.8, and contains 82f by weight of the acid. Hydrobromic acid begins to dissociate into its elements (c/. §45) at about 800 C.; it is, therefore, much less stable than hydrochloric acid, which begins to dissociate at about 1500 C. Iodine. 273. Occurrence and Preparation of Iodine.--The chief source of iodine until recently was the ashes of certain sea-plants which absorb iodine compounds from sea-water. At the present time the element is obtained largely from the Chile saltpeter deposits. In these deposits the iodine is found chiefly as sodium iodate, NaI0s. Iodine may be set free from an iodide in just the same way that chlorine and bromine are set free from chlorides and bromides respectively, viz., by heating it with a mixture of manganese dioxide and dilute sulphuric acid. A representative equation is,--Mn02 + 2 Nal + 3 H2S04 = MnS04 + 2 NaHS04 + 2H20 + I2. The stages in which the reaction takes place are partly represented by the equations, (1) Nal + H2S04=HI + NaHS04; (2) Mn02 + 4 HI = Mnl2 + 2 H20 + 2 1; (3) Mnl2 + H2S04 = MnS04 + 2 HI. Iodine may also be set free from an iodide by means of chlorine or bromine (ef. § 269). HYDRIODIC ACID. 261 2 Nal 4-Br2 » 2 NaBr +21. 2 Nal + Cl2 2 NaCl +2 1. 274. Properties of I...
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Product Details

  • ISBN-13: 9781150663314
  • Publisher: General Books LLC
  • Publication date: 5/28/2012
  • Pages: 122
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.26 (d)

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