Ammonium sulphide

It is prepared commercially by treating cyanamide (from calcium cyanamide) with ammonium sulphide ... 

It is convenient to include under Aromatic Amines the preparation of m-nitroaniline as an example of the selective reduction of one group in a polynitro compound. When wt-dinitrobenzene is allowed to react with sodium polysulphide (or ammonium sulphide) solution, only one of the nitro groups is reduced and m-nitroanUine results. Some sulphur separates, but the main reaction is represented by ... 

The acid is conveniently prepared by the reduction of p-nitrophenylacetic acid with ammonium sulphide (hydrogen sulphide in ammoniacal solution). 

Croups Dodecacarbonyidi vanadium (Ammonium sulphide) Triethylphosphine... 

Add a few drops of ammonium sulphide solution and warm gently. A brown colouration 01 precipitate is formed. 

Warm a few of the crystals with yellow ammonium sulphide solution for a few minutes, acidify with hydrochloric acid, und finally add a little feiric chloride. A deep blue colouration Ls produced, due to the formation of methylene blue. 

Ammonium sulphide) Barium sulphide Calcium sulphide Chromium (II) sulphide Copper (II) sulphide Diantimony trisulphide Dibismuth trisulphide Dicaesium selenide Dicerium trisulphide Digold trisulphide Europium (II) sulphide Germanium (II) sulphide Iron disulphide Iron (II) sulphide Manganese (II) sulphide Mercury (II) sulphide Molybdenum (IV) sulphide... 

Ammonium sulphide DIammonium phosphite Diammonium phosphate... 

These authors provided further evidence in support of their conclusions by performing TCV experiments on n-GaAs samples that had been treated with (a) RuC13 and (b) ammonium sulphide. Ru is known to increase the surface state density and sulphur is known to remove surface states. 

Theory Theoretically the cleavage of thioamide link in ethionamide takes place in an acidic medium. Subsequent neutralization with NH4OH yields ammonium sulphide which on addition of silver nitrate yields a precipitate of Ag2S. Thus we have ... 

Since treatment would normally start around implantation, one would not expect pre-implantation loss to be affected by treatment. However, if conceptuses are affected by the first treatment, they could be killed before leaving a scar on the uterus. To make very early resorptions visible, staining of the uteri in 20% ammonium sulphide is useful. After rinsing uteri in tap water, these resorptions can be seen as small black dots. This procedure... 

Solid mixtures of CdS and HgS have been shown to form solid solutions after treatment with certain solutions, such as concentrated ammonium sulphide [16]. This may be due partly to the very similar ionic radii of the two cations and (maybe more important) the ability of Hg to diffuse readily in solids. Therefore it is probable that solid solutions can readily form in this system. 

Nitrito-pentammino-rhodium Nitrate, [Rh(NHs)5N0a](N03)2, is prepared from chloro-pentammino-rhodium chloride by dissolving it in dilute aqueous sodium hydroxide and adding pure sodium nitrite and dilute nitric acid. The substance separates as a white crystalline powder which is recrystallised from hot water. It is fairly soluble in cold water, insoluble in alcohol, and the aqueous solution, unlike that of the nitrato-nitrate, is not converted into aquo-nitrite on boiling. It is also unacted on by sodium hydroxide or ammonium sulphide. 

E. D.onath prepared a cone. aq. soln. by distilling ammonium chloride with a hot soln. of sodium sulphide until half the liquid has passed to the receiver. E. W. Parnell and J. Simpson patented a process for making ammonium sulphide by heating the mixed residues of the Leblanc and ammonia-soda processes they also used calcium or barium sulphide instead of the Leblanc residue. Ammonium carbonate with calcium or barium sulphide can also be used (NH COj-l-BaS =BaC03-t-(NH4)2S. According to J. Habermann, ammonium sulphide free from arsenic can be obtained only by using materials free from that element. 

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