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Hydrogen iodide properties

Properties—Hydrogen iodide is a colourless gas. It is very soluble in water and fumes in moist air (cf. hydrogen chloride), to give hydriodic acid. Its solution forms a constant boiling mixture (cf. hydrochloric and hydrobromic acids). Because it attacks mercury so readily, hydrogen iodide is difficult to study as a gas, but the dissociation equilibrium has been investigated. [Pg.333]

Chemical Properties. The most significant chemical property of L-ascorbic acid is its reversible oxidation to dehydro-L-ascorbic acid. Dehydro-L-ascorbic acid has been prepared by uv irradiation and by oxidation with air and charcoal, halogens, ferric chloride, hydrogen peroxide, 2,6-dichlorophenolindophenol, neutral potassium permanganate, selenium oxide, and many other compounds. Dehydro-L-ascorbic acid has been reduced to L-ascorbic acid by hydrogen iodide, hydrogen sulfide, 1,4-dithiothreitol (l,4-dimercapto-2,3-butanediol), and the like (33). [Pg.13]

Hydrogen iodide is hardly endothermic. This property makes it rather unstable... [Pg.227]

The carbon-chain structure of the sugar obtained from hamameli-tannin was established by the classical method of Kiliani,26 which is based on the reduction, with hydrogen iodide, of polyhydroxy acids to fatty acids. Treatment of the calcium salt of hamamelonic acid under these conditions led to inconclusive results. The reduction of the corresponding, crystalline ammonium salt, however, furnished 3.5 to 5% of 2-methylvaleric acid, which was identified by the properties of its crystalline p-iodophenacyl ester. Thus, it was proved that the sugar must have structure XIV. [Pg.270]

Property. Hydrogen fluoride. Hydrogen chloride. Hydrogen bromide. Hydrogen iodide. [Pg.200]

The order of reactivity of the halogens is F2 > Cl2 > Br2 > 12. Fluorine is too reactive to be of practical use for the preparation of aromatic fluorine compounds and indirect methods are necessary (see Section 23-1 OB). Iodine usually is unreactive. It has been stated that iodination fails because the reaction is reversed as the result of the reducing properties of the hydrogen iodide that is formed ... [Pg.1045]

Properties Colorless or pale-yellow liquid (an aqueous solution of hydrogen iodide, which is a gas at... [Pg.662]

Properties Pale-yellow powder odorless, tasteless darkens on exposure to light. D 5.675, mp 556C. Soluble in hydrogen iodide, potassium iodide, potassium cyanide, ammonium hydroxide, sodium chloride, and sodium thiosulfate solutions. Insoluble in water. [Pg.1126]

Although chlorine and bromine react with methane and many other compounds and form substitution-products, iodine does not show this power except under exceptional circumstances. The three halogens resemble one another in chemical properties, but there is a marked decrease in activity as we pass from chlorine to iodine. Chlorine and bromine react with hydrogen with the evolution of heat, whereas under the same conditions hydrogen iodide is formed with the absorption of heat. As the process of substitution involves the formation of a compound of... [Pg.29]

The difference in properties of the various compoundated hydrogens can be shown by a comparison of the following compounds ethyl iodide, ammonium iodide, and oxonium iodide. Ethyl iodide requires the highest temperature for its dissociation and the hydrate of hydrogen iodide the lowest. This shows why hydrogen is evolved if a metal is dissolved in an aqueous solution of an acid, or if a metal such... [Pg.159]

Ethers are generally spoken of as inert compounds. What is really meant is that they do not react with metals, alkalies, and most acids at ordinary temperatures with appreciable velocity. As pointed out, the properties of the olefinated hydrogen afford an explanation. The same holds true for tertiary amines. It has already been pointed out that a difference is shown in the stability, or better, the reactions of the olefinated hydrogen depending upon the other substances present. Thus, in the presence of chlorides, such as zinc chloride, etc., ethyl iodide reacts less rapidly than the chloride. The same relative order was observed with ammonium chloride, bromide, iodide, and hydroxide. The decomposition of ethers by heating with hydrogen iodide, a method used for the determination of the amount of ether groups present in compounds, may be explained on the same basis. They are simple displacement reactions. The existence of the intermediate addition compounds (oxonium salts) has been proven ... [Pg.160]

Table 28. Physical Properties of Hydrogen Chloride, Hydrogen Bromide and Hydrogen Iodide... Table 28. Physical Properties of Hydrogen Chloride, Hydrogen Bromide and Hydrogen Iodide...

See other pages where Hydrogen iodide properties is mentioned: [Pg.327]    [Pg.327]    [Pg.208]    [Pg.898]    [Pg.564]    [Pg.845]    [Pg.345]    [Pg.14]    [Pg.169]    [Pg.78]    [Pg.3]    [Pg.5]    [Pg.199]    [Pg.282]    [Pg.208]    [Pg.898]    [Pg.40]    [Pg.222]    [Pg.450]    [Pg.293]    [Pg.18]    [Pg.679]    [Pg.170]    [Pg.354]    [Pg.8]   
See also in sourсe #XX -- [ Pg.31 ]




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