Hydrogen sulfide ion

Hydrogen sulfide ion HS and anions of the type RS are substantially less basic than hydroxide ion and react with both primary and secondary alkyl halides to give mainly substitution products... 

The conjugate base of a polyprotic acid is amphiprotic it can act as either an acid or a base because it can either donate its remaining acidic hydrogen atom or accept an acidic hydrogen atom and revert to the original acid. For example, a hydrogen sulfide ion, HS-, in water acts as both an acid and a base ... 

Finally, it should be mentioned that polysulfides are formed on oxidation of hydrogen sulfide ions in water, either electrochemically [111] or by oxidation with molecular oxygen ... 

H2S (hydrogen sulfide, colorless), HS (hydrogen sulfide ion, colorless), (sulfide ion, colorless), 82 (disulfide ion, orange), 83 (trisulfide ion, orange). 

Carefully controlling the concentration of hydrogen sulfide ions and dissolved lignin... 

In an aqueous solution, 1,2-dichloroethane reacted with hydrogen sulfide ions forming 1,2-dithioethane (Barbash and Reinhard, 1989). 

Chemical/Physical. In an aqueous phosphate buffer solution (0.05 M) containing hydrogen sulfide ion, ethylene dibromide was transformed into 1,2-dithioethane and vinyl bromide. The hydrolysis half-lives for solutions with and without sulfides present ranged from 37 to 70 d and 0.8 to 4.6 yr, respectively (Barbash and Reinhard, 1989). Dehydrobromination of ethylene dibromide to vinyl bromide was observed in various aqueous buffer solutions (pH 7 to 11) in the temperature range of 45 to 90 °C. The estimated half-life for this reaction at 25 °C and pH 7 is 2.5... 

The most effective synthesis for thietanones is the eliminative cyclization of halogenated ketones with hydrogen sulfide ions in the presence of bases (Eq. lOb). The reaction of 1,3-dibromoketone derivatives with sodium hydrogen sulfide produced 3-thietanones in association with a five-membered cyclic disulfide (Eq. 10c). 

A ring opening of the thietanone molecule can easily be induced by thio-phile attack of hydrogen sulfide ions, which leads to the formation of an enolate ion (Eq. 56). This reaction also depends on the degree of methylation... 

Hydrogen sulfide ion (HS ) Use of hydrogen sulfide as a nucleophile permits the conversion of alkyl halides to compounds of the type RSH. These compounds are the sulfur analogs of alcohols and are known as thiols. 

For example, a hydrogen sulfide ion in water acts as both an acid and a base ... 

Write equations to show how the hydrogen sulfide ion, HS", can react with water. First show the ion acting as an acid. Then show the ion acting as a base. 

I It is critical to specify the charges in formulas for ions and to include the word ion if the name without that word means something else, such as sodium ion or hydrogen sulfide ion. 

Write formulas for hydrogen sulfide, hydrogen sulfide ion, and hydrosulfuric acid. 

Anunonium ion Hydrogen cyanide Hydrogen carbonate ion Hydrogen sulfide ion Water Ethanol... 

For each of these ions, what corresponding neutral molecule has the same electronic structure Example HS , the hydrogen sulfide ion, has the same electronic structure as HCl. 

A simple mechanism of adsorption/oxidation of hydrogen sulfide was first proposed by Hedden and coworkers [31]. According to them, dissociation of hydrogen sulfide occurs in the film of adsorbed water at the virgin carbon surface and then hydrogen sulfide ions, HS , are oxidized by oxygen radicals to elemental sulfur. Since then many studies have been done to account for such factors as a role of water [26, 32, 34, 36, 37, 40, 48, 49], role of oxygen [18—27], autocatalysis by sulfur [27, 28], influence of pore sizes [19, 29, 33, 35, 38], role of carbon surface chemistry [41—44], the effects of ash [49, 58—60], and last but not least, speciation of surface oxidation products [41—46]. 

It has also been found in literature [84] that iodide ions, I- bromide ions, Br and azide ions, N3, inhibit the corrosion of metallic iron in acid solution. On the other hand, the presence of hydrogen sulfide ions, HS- thiosulfate ions, S2O2 and thiocyanate ions, SCN, accelerate the corrosion of metallic iron in acidic solution [84]. 

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