Silver hyponitrite

Lithium carbonate, 0533 Lithium dithionite, 4687 Magnesium carbonate hydroxide, 0534 Magnesium nitrate, 4693 Magnesium nitrite, 4692 Magnesium sulfate, 4696 Potassium carbonate, 0531 Potassium nitrite, 4649 Silver hyponitrite, 0031 Sodium acetate, 0779 Sodium carbonate, 0552 Sodium disulfite, 4808 Sodium dithionite, 4807 Sodium hydrogen carbonate, 0390 Sodium hydrogen sulfate, 4446 Sodium metasilicate, 4805 Sodium nitrite, 4720 Sodium sulfate, 4806 Sodium tetraborate, 0185 Sodium thiosulfate, 4804... 

Sodium hypnnitrite Na N 0 is formed (I) by reaction of sodium nitrate or nitrite solution with sodium amalgam (sodium dissolved in incrcuryl, alter which acetic acid is added to neutralize the alkali. Sodium stannite ferrous hydroxide, or electrolytic reduction w ith mercury cathode may also be utilized. (2) by reaclion of hydroxylamine sulfonic acid and sodium hydroxide. Silver hyponitrite is formed by reaclion of silver nitrate solution and sodium hyponitrite. 

In 1800, H. Davy prepared what he believed to be the potassium salt of nitrous oxide by exposing a mixture of potassium sulphide and hydroxide to nitrous oxide. The sulphide was converted into sulphate, and by solution and crystallization at a low temp., he obtained the compound mingled with very little potassium oarbonate and still less sulphide. The produot evolved nitrous oxide when heated, or when treated with oarbon dioxide, of sulphuric, hydrochlorio, or nitric acid. H. Hess also obtained what may have been silver hyponitrite, by heating barium nitrate, and treating the product with eilver salt, and decomposing some of the crystals thus obtained by water. 

H20- -Na2N202. The soln. should then be treated with yellow mercuric oxide to destroy the hydroXylamine, and filtered. The alkaline liquid is neutralized by acetic acid, and, when silver nitrate is added, a precipitate of silver hyponitrite, Ag2N202, is formed. E. Divers prepared sodium hyponitrite by the following process ... 

Fifty grams of hydroxylamine disulphinate—prepared by the action of sulphur dioxide on a soln. of sodium nitrite—are dissolved in 35 c.c. of boiling water. The soln. is cooled by ice, and, while keeping the temp, below 30°, it is mixed with 10 c.c. of a concentrated solution of sodium hydroxide (1 1), and 90 c.c. more alkali-lye is then added. The mixture is heated to about 50° for 30-45 minutes, and poured into a litre of water. The undecomposed disulphonate and hydroxylamine are destroyed by adding yellow mercuric oxide, and the clear filtered soln. is made up to four litres and treated with silver nitrate so long as the light yellow silver hyponitrite is precipitated. The precipitate is washed with warm water until it is free from.acid. 

In the analytical determination of the hyponitrites, W. Zorn treated soln. of the free acid, or of its salts in cold dil. nitric acid with an excess of silver nitrate, and just neutralized the free acid with ammonia or sodium carbonate. The washed and dried precipitate was weighed as silver hyponitrite, or weighed as metal or chloride. A. Thum treated the aq. soln. of the acid with an excess of a soln. of permanganate, and in 15 minutes added sulphuric acid after standing for another hour the soln. was warmed to 30°, and treated with a known quantity of 0-1A-oxalie acid sufficient to decolorize the permanganate. The excess oxalic acid was determined by permanganate titration. A. Hantzsch and A. Sauer, and... 

D. H. Jackson (1893) made it by treating silver hyponitrite with an alcoholic soln. of ammonium sulphide, and evaporating the filtered liquid in vacuo over sulphuric acid. Ammonium hyponitrite furnishes long needle-Hke crystals readily soluble in water and in alcohol. W. Zorn, D. H. Jackson, W. Wislicenus, E. Divers,... 

L. Kaufmann, M. Berthelot and J. Ogier, 0. Piloty, and E. Divers and T. Haga. The methods employed are indicated in connection with the preparation of the acid. P. Sabatier and J. B. Senderens could not make it by the union of nitric oxide and silver at any temp, tried. E. Divers recommended the following process for preparing silver hyponitrite ... 

Silver hyponitrite is bright yellow, and if pale in colour it generally contains a trace of ammonia, or some silver oxide. If black silver suboxide is present, the colour may be greyish-yellow, and with other impurities present, the colour may be bright green. There is no evidence that the difference in colour is due to the presence of allotropic forms. When precipitated from strongly alkaline soln., or from cone. soln. of the sodium and silver salts, the precipitate is compact, and dense, but if precipitated from dil. soln., it is flocculent and bulky. A. Kirschner, and C. Paal and F. Kretschmer, obtained crystals of silver hyponitrite by deposition from the ammoniacal soln., either by evaporation or by dilution with water. 

Hyponitrites are produced by the action of sodium amalgam, that is, a solution of sodium in mercury containing about 4 per cent, of the former, on a solution of potassium or sodium nitrite. After the mixture has stood for some days, it is rendered slightly acid with acetic acid, and silver nitrate is added. A yellow precipitate of silver hyponitrite is produced other hyponitrites may be prepared from it by the addition of the calculated quantity of the respective chloride. The acid can also be liberated by the addition to a very dilute aqueous solution of the equivalent amount of hydrochloric acid. On warming the solution of the acid, nitrous oxide is evolved but nitrous oxide does not unite with water to form the acid. 

Silver hyponitrite, Ag2Na02.—Addition of silver nitrate to solutions of alkali-metal hyponitrites produces the hyponitrite as a yellowish precipitate. It is very slightly soluble in water, is sensitive to light, and is decomposed by heat into silver, nitrogen oxides, and nitrogen.3... 

After the reaction is finished, the insoluble silver hyponitrite Ag2N202 is precipitated with AgNOs. H2N2O2 is accessible by treating the silver salt with a solution of HCl gas in diethyl ether, or by oxidation of hydroxylamine with copper, silver, or mercury oxide. 

Silver hyponitrite, a useful synthetic reagent, has been prepared by a new... 

Silver fulminate, 0301 Silver hexahydrohexaborate(2—), 0027 Silver hexanitrodiphenylamide, 3429 Silver 1,3,5-hexatrienide, 2052 Silver 3-hydroxypropynide, 1088 Silver hyponitrite, 0031... 

Hyponitrous acid—H3N4O3—31—Known only in combination. Silver hyponitrite is formed by reduction of sodium nitrate by nascent H and decomposition with silver nitrate. 

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