Barium silver nitrite

Silver Nitrite. Silver nitrite, AgN02, is prepared from silver nitrate and a soluble nitrite, or silver sulfate and barium nitrite. 

B. C. Dutt and S. N. Sen found that when nitric oxide is passed into a suspension of barium dioxide in water, barium nitrite, not nitrate, is formed. P. Sabatier and J. B. Senderens observed no change when nitric oxide is passed over Cuprous Oxide at 500°. H. A. Auden and G. J. Fowler observed that dry nitric oxide and Silver oxide, at ordinary temp., form silver and silver nitrate P. Sabatier and J. B. Senderens also obtained silver and silver nitrite by passing nitric oxide into water with silver oxide in suspension. C. F. Schonbein found gold oxide is reduced by moist nitric oxide, forming nitrous acid. P. Sabatier and J. B. Senderens found that titanium sesquioxide forms white titanic oxide when heated in an atm. of nitric oxide and that stannous oxide below 500° burns in an atm. of nitric oxide, forming stannic oxide. If nitric oxide be passed into water with lead dioxide in suspension, the water is coloured, and in about 3 hrs., lead nitrite and nitrate are formed, and later, rhombic crystals of a basic nitrite. B. C. Dutt and S. N. Sen said that the nitrate is formed by the action of the dioxide on the nitrite. Lead dioxide is reduced to lead oxide by nitric oxide at 315°, and H. A. Auden and G. J. Fowler found that the reaction begins at 15°, when a basic lead nitrite is... 

The same salt was prepared by E. Peligot by adding barium nitrite to a soln. of silver nitrate. E. Mitsoherlioh, and V. Kohlschiitter and E. Eydmann added sodium nitrite to a soln. of silver nitrate, and crystallized the precipitated silver nitrite (and oxide) from its soln. in boiling water V. Meyer worked with potassium nitrite and silver nitrate J. Persoz melted equal parts of silver and potassium nitrates, and crystallized the silver nitrite from hot water. E. Priwoznik treated an excess of silver with nitric acid W. J. Russell, and A. R. Leeds passed hydrogen into a cone. soln. of silver nitrate and E. Divers heated silver nitrate in a current of nitric oxide. The aq. soln. decomposes below 100°, and J. Lang, and N. W. Fischer said that the losses are so great when the attempt is made to purify the salt by recrystallization, that it is better instead to wash the salt with a little cold water. A. Naumann and A. Rucker crystallized the salt from a soln. of nitrous acid. 

Lithium nitrite, LiN02.—The monohydrate, LiN02,H20, is obtained by the interaction of lithium chloride and silver nitrite,7 and also by that of lithium sulphate and barium nitrite.8 It forms colourless, deliquescent needles, very soluble in water. At 0° C. its density is 1 615,9 and between 21° C. and 31° C. 1 671. Its molecular volume is 63-44.10 Under the influence of sunlight it decomposes, with formation of the red nitride. Oswald11 also prepared a colourless, deliquescent semihydrate, and proved that the colourless anhydrous salt becomes hydrated through the action of the moisture of the atmosphere. 

Silver nitrite, AgNOa.—Sodium nitrite 4 and the corresponding salts of potassium and barium react with silver nitrate to form silver nitrite. It crystallizes in long, greenish-yellow, rhombic needles, the density at 0° C. being 4-542, and between 21° and 31° C. 4-453.6 At 15° C. its percentage-solubility is 0-2752,6 and at 18° C. 0-0216 gram-molecules dissolve in 1 litre of water.7... 

Aqueous solutions of nitrous acid are synthesized by the reaction of nitrite salts with strong acids. The reactions of silver nitrite with HCl and barium nitrite with sulfuric acid both produce insoluble precipitates that can easily be separated from the nitrous acid solution. 

Histidine hydrochloride (2 g.) is suspended in concentrated hydrochloric acid and slowly treated with silver nitrite (3 g.). After removal of excess nitrous acid and silver chloride, the liquid is concentrated to a sirup, which is taken up in alcohol, treated with an excess of alcoholic trimethylamine solution, and kept at 80° for 8 hours. After removal of the alcohol the product is precipitated with phosphotungstic acid. The phosphotungstate is decomposed with barium hydroxide in the usual manner, and the solution of the base thus obtained is strongly concentrated to remove trimethylamine, treated with hydrochloric acid, and the resulting chloride is taken up in alcohol and precipitated with chloroplatinic acid. It is finally converted into the chloroaurate, m.p. 183° with decomposition (14). 

BaAg2(N02)4.H20, from a soln. of the component salts. The formula is here due to M. Oswald, who examined the three nitrites of the alkaline earths, and found only barium forms a double salt. The conditions of stability are represented by AB, Fig. 85. The corresponding diagrams for strontium and calcium nitrites do not show any evidence of the formation of silver strontium nitrite, or of a silver calcium nitrite nor is any strontium barium nitrite formed, for the two salts give a series of mixed crystals, (Ba,Sr)(N02)2.H20. 

Iridium Chlor-nitrites of Barium,1 2 Ba3(IrCl6)2.3Ba3Ir.,(N02)u Caesium,8 Css(N02)2.IrCl4 Lead,3 Pb3(N02)4.2lrCl4.2Pb(OH)2 Mercury,3 Hg3(N02)4.2lrCl4 and Silver,3 Ag3(NOi)2.IrCl1. have also been described. 

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