11th International Congress on Catalysis - 40th Anniversary. by Hightower J.W., et al. (eds.)

By Hightower J.W., et al. (eds.)

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By Hightower J.W., et al. (eds.)

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Extra resources for 11th International Congress on Catalysis - 40th Anniversary. Baltimor, 1996

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Concentrated nitric acid or chromic acid in acetic acid solution reacts to form carbon dioxide and iodoethylene. With fuming nitric acid a very violent reaction takes place with evolution of carbon dioxide and separation of iodine and of triiodovinyl nitrate, which has the formula CIONO2 and forms yellow crystals (Nef) . It has powerfully toxic properties, the vapour strongly irritating the mucous membranes and particularly the eyes (Nef) . 2 Analysis of Divalent Carbon Compounds DETECTION OF CARBON MONOXIDE The various reactions that have been proposed for the detection of carbon monoxide depend on its reducing properties and its power of reaction with haemoglobin.

In sunlight, however, hydrobromic acid is formed. Bromine is soluble in alcohol, ether, chloroform and carbon disulphide, but alcoholic and ethereal solutions rapidly decompose. It dissolves more readily in aqueous solutions of hydrobromic acid, potassium bromide and hydrochloric acid. Solutions in the last may be obtained containing 13% bromine. The latent heat of volatilisation of bromine at 58° C. is 45-6 calories. The chemical properties of bromine are similar to those of chlorine, but it is less active.

EICHLER, Z. anal. , 1934, 99, 272. 3 In order to prepare this solution, i part by weight of potassium iodide (free from iodine) is dissolved in 10 parts of water. The solution should be colourless and remain so when a few drops of dilute sulphuric or hydrochloric acid are added. CHLORINE AND BROMINE : DETERMINATION 43 introduced into the globe, which is allowed to stand. By this method one equivalent of chlorine sets free one equivalent of iodine, which remains dissolved in the excess potassium iodide.

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