Hydrogen sulphide properties

Composition - which describes the proportion of hydrocarbon components (C, - Cj+) (which determine the fluid properties), and how many non-hydrocarbon substances (e.g. nitrogen, carbon dioxide and hydrogen sulphide) are present. 

Hydrogen sulphide oeeurs naturally, e.g. in natural gas and petroleum, voleanie gases, and from deeaying organie matter. It may be present near oil wells and where petroleum is proeessed. Commereially it is obtained as a by-produet from many ehemieal reaetions ineluding off-gas in the produetion of some synthetie polymers (e.g. rayon, nylon) from petroleum produets, and by the aetion of dilute mineral aeids on metal sulphides. Physieal properties are summarized in Table 9.14 and effeets of temperature on vapour pressure are shown in Figure 9.5. 

Hydrogen sulphide is used in the preparation of metal sulphides, oil additives etc., in the purification and separation of metals, as an analytical reagent and as raw material in organic synthesis. Physical properties are summarized in Table 8.11 and effects of temperature on vapour pressure are shown in Figure 8.4. 

Chromyl chloride also has a dangerous oxidising property, which makes it behave in a similar way to chromium trioxide. This goes for ammonia (incandescence), hydrogen sulphide, phosphine, sulphur and disulphur dichloride... 

As esters the alkyl halides are hydrolysed by alkalis to alcohols and salts of halogen acids. They are converted by nascent hydrogen into hydrocarbons, by ammonia into amines, by alkoxides into ethers, by alkali hydrogen sulphides into mercaptans, by potassium cyanide into nitriles, and by sodium acetate into acetic esters. (Formulate these reactions.) The alkyl halides are practically insoluble in water but are, on the other hand, miscible with organic solvents. As a consequence of the great affinity of iodine for silver, the alkyl iodides are almost instantaneously decomposed by aqueous-alcoholic silver nitrate solution, and so yield silver iodide and alcohol. The important method of Ziesel for the quantitative determination of alkyl groups combined in the form of ethers, depends on this property (cf. p. 80). 

The properties of this electrode approach those of an ideal specific electrode. It has an anionic response almost exclusively for sulphide ions in a broad activity interval (up to 10 molar concentration in hydrogen sulphide solutions). Only the cyanide ion interferes here at high concentrations. This electrode has a cation response for silver ions in a wide activity range (in Ag(I) complexes up to 10 m Ag [325]), where only Hg interferes [417]. 

Property Ammonia (NH,) Hydrofluoric acid (HF) Hydrogen sulphide (H2S) Methane (CH ) Water (H20)... 

Properties. 1. What odoitr does the evolving gas have Light the hydrogen sulphide with a burning splinter, hold a wet piece of litmus paper over the flame, and watch how its colour changes. Write the equation of the reaction. 

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 ... 

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. 

Pour an ammonium sulphide solution into a potassium chromate or dichromate solution and heat the mixture. How does the solution s colour change What is the composition of the precipitate Write the equation of the reaction. What properties does chromium (VI) exhibit in this reaction How does an acidified potassium chromate or dichromate solution react with hydrogen sulphide, sulphur dioxide, and an iron(II) salt Write the equations of the reactions. 

What happens when iron(III) chloride reacts with hydrogen sulphide and ammonium sulphide Conduct the relevant reactions and write their equations. List the properties of iron(III) salts. How can sodium ferrite be prepared Which salts hydrolyze more strongly—ferrites or iron(III) salts What does this depend on ... 

Pour the ferrate solution into three test tubes. Add a barium chloride solution to one tube up to complete precipitation. What is the composition of the precipitate Pour hydrogen sulphide water into the second tube, and 2 N sulphuric acid into the third one. What is observed Write the equations of all the reactions. What properties do iron(VI) compounds have ... 

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. 

Sulphur is applied, commonly in the powdered form or as /lowers of sulphur, to medicinal purposes, and also agriculturally as a dust or dressing to check fungoid diseases of certain plants, ( specially the vine.5 The toxic properties of sulphur have not been fully elucidated and are variously ascribed to reduction to hydrogen sulphide, oxidation to polythionic acids, or to the vapour of the element itself, produced by slow vaporisation.8 If adsorbed pcntathionic acid be removed from... 

---