Iodine pentoxide

The iodic acid may then be dehydrated by heat, giving iodine pentoxide... 

Under high pressures and temperatures, iodine reacts with oxygen to form iodine pentoxide [12029-98-0] (44). The reaction of iodine with carbon monoxide under acidic conditions is catalyzed by palladium salts (45). Phosphorous vapor and iodine react to form phosphoms trHodide [13455-01 -17, PI (46). 

Iodine dissolves without reaction in concentrated sulfuric acid and with concentrated nitric acid it reacts to form iodine pentoxide (47). Iodine reacts with alkah metal hydroxide solutions to form the corresponding hypoiodite and the rate of the reaction increases with the alkaU concentration and temperature. At 50°C, the reaction is almost instantaneous ... 

Chlorine heptoxide is more stable than either chlorine monoxide or chlorine dioxide however, the CX C) detonates when heated or subjected to shock. It melts at —91.5°C, bods at 80°C, has a molecular weight of 182.914, a heat of vapori2ation of 34.7 kj/mol (8.29 kcal/mol), and, at 0°C, a vapor pressure of 3.2 kPa (23.7 mm Hg) and a density of 1.86 g/mL (14,15). The infrared spectmm is consistent with the stmcture O CIOCIO (16). Cl O decomposes to chlorine and oxygen at low (0.2—10.7 kPa (1.5—80 mm Hg)) pressures and in a temperature range of 100—120°C (17). It is soluble in ben2ene, slowly attacking the solvent with water to form perchloric acid it also reacts with iodine to form iodine pentoxide and explodes on contact with a flame or by percussion. Reaction with olefins yields the impact-sensitive alkyl perchlorates (18). 

Several quantitative procedures for concentrations above 0.1 vol % are available. Gas chromatographic analysis (78) is particularly useful because it is fast, accurate, and relatively inexpensive. The standard wet-chemical, analytical method (76) takes advantage of the reaction between iodine pentoxide and carbon monoxide at 423 K. 

Unusual exchange reactions are observed with or on the metal surfaces of a source itself. Sherwood and Turner (118) in their studies of the spectra of iodine pentoxide observed peaks due to copper oxygen, copper iodine, and copper oxygen iodine species (Cu2 , Cu2l, Cu3l2", ... 

Iodine pentoxide is used for analysis of carbon monoxide and for CO removal from air. It also is used as an oxidizing agent in other oxidation reactions. 

Iodine pentoxide is prepared by dehydration of iodic acid at 240°C. 

Iodine pentoxide is a strong oxidizing agent and reacts with various oxi-dizable substances. It oxidizes carbon monoxide to carbon dioxide. The reaction is quantitative and used to measure carbon monoxide in the air ... 

Ilosvay) by the action of hydrogen chloride on iodic acid (G. S. Serullas) of phosphorus pentachloride on iodine pentoxide (0. Brenkn) of iodine on sulphuryl chloride in excess (0. Ruff) 3S02Cl2+l2=2ICl3+3S02 and by heating iodine monochloride. 

Iodine pentoxide, however, is most conveniently prepared by the dehydration... 

The material is best heated in a tube between 90° and 110° so that the first portion of the water may be expelled without fusion. The temp, is then raised to 220°, and the operation concluded by a 4 hrs. heating at 240°, dry and purified air is passed through the tube during the operation. If fusion occurs before dehydration, some iodic acid may be enclosed within an impervious coating of anhydrous salt, and the escape of water prevented. If the air is inadequately dried, the iodine pentoxide may become brown, probably owing to the liberation of iodine and a similar result is obtained when the temp, rises over 250°. 

According to A. Ditte,7 the iodine pentoxide which has separated from an acid soln. slowly loses some water at 180°, and rapidly if the powdered substance is heated to 200°-210°, and even after heating to 250°, it may contain up to 0 006 per cent. 

According to H. W. Foote and L. H. Levy, soln. of the alkali chlorates in other molten salts gave f.p. indicating that the mol. wt. under those conditions are normal. A. Rosenheim and 0. Liebknecht48 found the mol. wt. of acid by the f.p. method depend on the concentration, and that the acid in dil. soln. is a monobasic acid, and in cone. soln. the acid is polymerized and exists as a dibasic acid, H2l206. E. Gro-schuff and P. Walden also showed that the electrical conductivity of iodic acid soln. corresponds with a monobasic acid, as is also the case with chloric and bromic acids. The monobasic acid, therefore, can be represented by A. Kekule s type of formula with iodine univalent or C. W. Blomstrand s type of formula, with iodine quinquevalent and iodic anhydride, i.e. iodine pentoxide will be represented ... 

E. Muller made potassium iodate by electrolyzing the iodide. H. L. Wheeler 44 made rubidium iodate, RbI03, by the action of a mol. of iodine pentoxide on one of rubidium carbonate by treating a hot dil. soln. of iodine trichloride with rubidium hydroxide or carbonate by the action of iodic acid on a hot cone. soln. of rubidium chloride, RbCl. T. V. Barker obtained a good yield by passing chlorine into a hot cone. soln. of a mixture of rubidium iodide and hydroxide whereby the sparingly soluble iodate is precipitated. Caesium iodate, CsI03, was made in a similar way. 

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