Properties of Hydrogen Sulphide

Pour bromine water, chlorine water, and acidified solutions of potassium permanganate and dichromate into separate test tubes. Pass a stream of hydrogen snlphide through all the tubes. What happens Write the equation of the reactions. What property of hydrogen sulphide is indicated by the occurring phenomena ... 

Summarize the properties of hydrogen sulphide and the experimental evidence of its composition. 

In solution the acidic properties of hydrogen sulphide appear and under the name of hydrosulphuric acid the compound may be compared with hydrochloric acid. 

Table 20. Some Physical Properties of Hydrogen Sulphide...

Even noble metals, such as copper, silver and mercury will dissolve in hydrogen sulphide with liberation of hydrogen, showing that due to the poor donor properties of hydrogen sulphide the position of the solvated metal ions is different in liquid hydrogen sulphide from that in water. 

Due to the reducing properties of hydrogen sulphide certain redox reactions take place, e.g.,... 

N. J. English and J. S. Tse, J. Phys. Chem. A, 115, 6226 (2011). Dynamical Properties of Hydrogen Sulphide Motion in its Clathrate Hydrate from Ab Initio and Classical Isobaric—Isothermal Molecular Dynamics. 

Pour 1-2 ml of hydrogen sulphide water and a sulphurous acid solution into a test tube. What occurs Write the equation of the reaction. What properties does sulphurous acid exhibit in the given case Identify the products formed when gaseous sulphur dioxide and hydrogen sulphide react. 

Properties of Nickelfll) Salts. Test the reaction of hydrogen sulphide and sodium sulphide with a solution of a nickel(II) salt. Acquaint yourselfwith the values of the solubility products of nickel and cobalt sulphides. 

The Selenides.—Hydrogen selenide exhibits stronger acidic properties than hydrogen sulphide, and many of the heavy metals may be precipitated as selenides from aqueous solutions of their salts under conditions generally analogous to those required for the precipitation of... 

Properties.—Thiophosphoryl chloride is a transparent colourless liquid which fumes in the air and smells of hydrogen sulphide. The formula has been established by analysis and vapour density determination. The density of the liquid is 1-66820 at 0° C. and 1-45.599 at the normal boiling-point, 125-12° C.8 The coefficient of expansion between these temperatures is given by8... 

In 1942, soon after demobilization from the army, he had defended his PhD thesis on the theme, Oxidation of Hydrogen Sulphide . He generalized this research in the book Intermediate Products of Complex Reactions in Gaseous Phase (Moscow-Leningrad, Publishing house AS USSR, 1946) where, for the first time, it has been shown that such intermediate products as sulfur oxide possess properties of free radicals and can propagate oxidation. It was an important scientific benchmark. 

Properties.—An aqueous solution of sodium nitroprusside deposits Prussian blue on exposure to light. In the presence of alkali sulphides— as, for example, ammonium sulphide—it yields a beautiful purple colour, which is very characteristic, and so sensitive that the presence of 0 0000018 gram of hydrogen sulphide in 0 004 c.c. can easily be detected.2 Ammonium hydroxide does not hinder the colour formation, but caustic alkalies destroy it. It gradually fades on standing, in consequence of oxidation of the sulphide to sulphite. The composition of the purple substance is uncertain, but Hofmann 3 suggests the formula Na3[Fe(CN)5(0 N.SNa)], since, by the action of thio-urea, CS(NH2)2, upon sodium nitroprusside, he obtained the complex derivative Na3[Fe(CN)5(0 N.SCNH.NH2)], as a carmine-red powder, closely similar to the substance under discussion.4... 

Several different processes have been used, the simplest being by the reaction of hydrogen sulphide with molybdenum pentachloride, or the reaction of sulphur vapour with molybdic oxide or molybdenum metal. The last of these processes has been called the SHS process (Self-Propagating High-Temperature Synthesis) and Russian workers have reported that the product is less contaminated with impurities and has almost identical lubricating properties to natural molybdenum disulphide. The crystal structure is considered in more detail later, but it seems probable that the initial product of syntheses has a disordered... 

In their roles as catalysts, the activity of carbons has been ascribed to several factors, depending on the reaction that is promoted. Hence, for example, Coughlin has attempted to describe most catalytic properties in terms of electronic effectshowever it has been suggested that the decomposition of hydrogen peroxide and nitrous oxide is controlled by the presence of surface complexes. On the other hand, the microporosity of carbons has been suggested to be very important in the catalysed oxidation of hydrogen sulphide. ... 

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