Ferrous Ammonium Sulphate Sulphide

Ferrous ammonium sulphate Q. 73 Ferrous sulphide for H2S generator IV, VIII, X, P. 70 Lead dioxide IV, IX Lead monoxide IV, IX Lead nitrate Q. 47, IX Litmus paper, blue Litmus paper, red Magnesium metal, powder IV Magnesium metal, ribbon II, IV, V, VIII... 

Materials Solutions of sodium chloride, calcium chloride, zinc sulphate, ferrous ammonium sulphate, copper sulphate, arsenic chloride, hydrogen sulphide, ammonium sulphide. 

Directions Put 5 c.c. of solutions of sodium chloride, calcium chloride, zinc sulphate, ferrous ammonium sulphate, copper sulphate, and arsenic chloride into separate test tubes and add 10 c.c. of hydrogen sulphide solution, (either some that you made in Experiment 56, or some of the laboratory reagent) into each. 

The crude coal gas is washed with ferrous sulphate solution, whereby the latter is converted into a suspension of ferrous sulphide in ammonium sulphate solution. This reacts with the ammonium cyanide, yielding ferrous ferrocyanide, Fe2[Fe(CN)6], or ammonium ferrous ferrocyanide, (NH4)2Fe[Fe(CN)6], according to circumstances. Potassium ferrocyanide may be obtained from these by treatment with lime, as m the spent oxide process. By repeatedly dissolving in water and precipitating with alcohol, the salt can be obtained in a very pure state.1... 

A tube of difficultly fusible glass, sealed at one end, is filled with a mixture of 3 parts of dry sea-sand and 2 parts of ammonium nitrate dried at 105°, which is kept in position by an asbestos plug the end of the tube is closed by a cork through which passes a delivery tube with a tap. A small aluminium box, fitted with a thermometer and serving as an air-bath, is arranged to slide along the tube. The best temp, to employ is 260<,-285°, and the back end of the tube is first heated when all the air has been expelled from the tube, the gas is passed, first through aqueous ferrous sulphate or alkaline sodium sulphide soln., VOL. VIII. 2 c... 

Nitroso derivatives of a more complex and more stable character than the foregoing were discovered by Roussin in 1858.2 This investigator observed that a black voluminous precipitate is obtained when a mixture of ammonium sulphide and alkali nitrite is added to an aqueous solution of ferrous sulphate. On boiling, the precipitate passes into solution. The liquid is filtered, and, upon cooling, black crystals separate out, the composition of which has been the subject of considerable discussion. The reaction does not proceed in perfectly neutral solution, a green liquor only being produced, consisting of sulphides of iron and sodium, entirely free from any nitroso derivative. The presence of a small quantity of acid, however, results in the formation of the nitroso derivative, probably because it liberates nitrous acid, which acts direct upon the ferrous salt. 

Materials Tin, aluminium, iron nail, concentrated nitric acid, solutions of stannous chloride, stannic chloride, ferric chloride, ferrous sulphate, ammonium sulphide. 

Materials Aluminium zinc tin solutions of zinc sulphate, ferrous sulphate, and ammonium sulphide. 

To determine which metal has dissolved proceed as follows After the reaction has taken place for about two minutes pour off the liquid from the tube containing the zinc and add to it a few drops of a solution of ammonium sulphide. (3) What is the color of the precipitate To determine whether the sulphide precipitated is that of iron or zinc add ammonium sulphide to solutions of ferrous sulphate and of zinc sulphate. 

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