Potassium sulphides

Dimethylcadmium Hafnium Potassium sulphide Pyrophoric alkyl... 

Potassium sulphide Rhenium (VII) sulphide Silver sulphide Sodium disulphide Sodium polysulphide Sodium sulphide Tin (II) sulphide Tin (IV) sulphide Titanium (IV) sulphide Uranium (IV) sulphide... 

Chloroform gives rise to the following reaction with potassium sulphide ... 

G. Taddei7 prepared potassium iodide by adding a dil. soln. of potassium monosulphide to an alcoholic soln. of iodine. In place pf potassium sulphide, J. von Liebig and C. Wittstock used barium sulphide, prepared by calcining sulphate with coke. According to R. Schindler, the products obtained by the sulphide process are contaminated with sulphur compounds. G. S. Serullas treated potassium antimoniate (prepared by calcining tartar emetic) with an alcoholic soln. of iodine as long as the soln. was decolorized. The filtered soln. was evaporated to the point of crystallization. 

W. P. Bloxam cone, a soln. of potassium hydroxide, half sat. with hydrogen sulphide, in vacuo over calcium chloride, and obtained small white tabular crystals of dodecahydrated potassium sulphide, K2S.12H20. The mother liquor furnished... 

The low temp, form is the more expansible, and has the higher sp. ht. The specific gravity of crystalline lithium sulphide, according to A. Mourlot, ranges from l-63 to 1 70 E. Filhol gives 2-471 for sodium sulphide, and 2 13 for potassium sulphide— E. Filhol s numbers presumably refer to the hydrated salts. O. Boch s values for the sp. gr. of aq. soln. arq indicated below. 

The anomalous change in the eq. conductivity with cone, is associated with the marked hydrolysis which occurs. Similarly for potassium sulphide ... 

H. Riesenfeld found the solubility of ammonia in soln. of sodium sulphide to be a linear function of the Na2S-conc. and they measured the ammonia press, of A-soln. of ammonia in sodium sulphide. With soln. containing 0 5, 1, and 1 5 mol. of sodium monosulphide, the respective press, of the ammonia were 15 18, 16 94, and 18 55 mm., when the press, of the ammonia in 2V-aq. soln. was 13 45 mm. According to W. P. Bloxam, potassium sulphide is stable at a low red heat and does not decompose when it is melted. P. Berthier stated that it is volatilized at high temp. When it is roasted in the air, potassium sulphide... 

J. S. Thomas and A. Rule measured the f.p. of mixtures of sulphur and sodium or potassium sulphide and W. Biltz and E. Wilke-Dorfurt measured the m.p. of... 

W. P. Bloxam does not recommend the preparation of this salt by passing hydrogen sulphide into an alcoholic soln. of ammonia because a complex salt, (NH S.wNHiS, is obtained, and the crystals contain alcohol. R. Laming made an aq. soln. of ammonium hydrosulphide by heating ammonium carbonate or gas liquor with sodium sulphide P. Spence, by heating the tank waste from the Leblanc soda process or gas lime with ammonium salts in a stream of steam and J. J. Berzelius recommended subliming a mixture of ammonium chloride and potassium sulphide—not in excess. 

J. T. Way, and T. Twynam heated Thomas slag with soda, and extracted the alkali phosphate with M ater. N. A, Helouis and M. Rychonnet, L. Imperatori, and F. Jean calcined a mixture of the phosphate with sodium sulphate and carbon C. Schwarz, and M. Boblique heated the mineral with iron so as to make ferric phosphate, which was then heated with sodium sulphate and carbon. In each of these cases the alkali phosphate was leached from the mass. M. Drevermann treated the iron phosphate with sodium sulphide, C. Clemm with potassium sulphide. 

Add solutions of potassium sulphide and iodide to small amounts of a potassium permanganate solution in separate test tubes. Heat the solutions. How does their colour change What precipitates Write the equations of the reactions. ... 

If the powder bums in the open potassium sulphide is oxidized to sulphate. When blackpowder burns slowly the products, apart from carbon, include such components as potassium sulphide, sulphate, carbonate, cyanide, nitrate and nitrite. 

Potassium sulphide so formed may undergo further reactions, viz. ... 

A part of the unburnt potassium sulphide and sulphur gives K,S2. 

Trithionate is also produced when sulphur dioxide is passed into a mixture of solutions of potassium sulphide and potassium hydrogen sulphite 4... 

This is in accordance with its character as a thio-anhydride. It is transformed into hydrogen cyanide and thioeyanic acid by the action of hydrogen, hydrogen sulphide or potassium sulphide. 

This acid was isolated by Winterl (1790), Buchholz (1798) and Rink (1804).4 Its potassium salt was first prepared by Porret in 1808 by boiling potassium sulphide solution with Prussian blue. The composition of the acid was first determined by Berzelius in 1820. The question of the formation of the acid in animals has been the subject of investigation by Dezani and others, but their results have led to the conclusion that the acid is not produced in the animal organism, but is purely exogenetic.6... 

Heavy Metals and Arsenic. — Evaporate to dryness on (lie sand-bath a mixture of 5 gm. of potassium liisulphite and 5 cc. of sulphuric acid (sp. gr. 1.84), and dissolve ll)c residue in 20 cc. of water. 10 cc. of this solution. should show ne change on the addition of hydrogen. sulphide water. On adding to the other 10 cc. of the potassium sulphide solid ion a solution of ammonium molylxhito in nitric, acid, mid hen t mg the mixture to 70 to 80° C., the liquid should not impure a yellow color, nor should a yellow precipitate Form. 

Nitrogen. — Mix 100 cc. of the potassium sulphide solution in a distilling flask with 50 cc. of nitrogen-free sodium hydroxide solution (sp. gr. 1.3). Add 1 gm. of zinc dust, and distil off about 50 cc., collecting the distillate in a U-tube receiver containing about 20 cc. of water and 2 to 3 cc. of decinormal hydrochloric acid. Titrate the distillate with decinormal potassium hydroxide, using methyl orange as the indicator. The ammonia distilled over should not have neutralized more than 0.2 cc. of the decinormal acid. 

Nitrogen. — The test for nitrogen is to l>e earned out as described under Potassium Sulphide Solution. 

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