Chemical elements
    Physical Properties
    Chemical Properties
      Barium Hydride
      Barium Subfluoride
      Barium Fluoride
      Acid Barium Fluoride
      Barium Subchloride
      Barium Chloride
      Barium Bromide
      Barium Perbromides
      Barium Iodide
      Barium Periodides
      Barium Mixed Halides
      Barium Mixed Perhalides
      Barium Oxychloride
      Barium Hypochlorite
      Barium Chlorite
      Barium Chlorate
      Barium Perchlorate
      Barium Oxybromide
      Barium Hypobromite
      Barium Bromate
      Barium Perbromate
      Barium Oxyiodide
      Barium Iodate
      Barium Periodate
      Barium Manganites
      Barium Manganate
      Barium Permanganate
      Barium Suboxide
      Barium Oxide
      Barium Hydroxide
      Barium Peroxide
      Barium Peroxyhydrate
      Barium Tetroxide
      Barium Sulphide
      Barium Hydrosulphide
      Barium Polysulphides
      Barium Hydroxyhydrosulphide
      Barium Oxysulphides
      Barium Sulphite
      Barium Thiosulphate
      Barium Dithionate
      Barium Trithionate
      Barium Tetrathionate
      Barium Pentathionate
      Barium Sulphate
      Acid Barium Sulphates
      Barium Pyrosulphate
      Barium Persulphate
      Barium Selenide
      Barium Selenite
      Barium Selenate
      Acid Barium Selenate
      Barium Telluride
      Barium Tellurite
      Barium Tellurate
      Barium Chromite
      Barium Chromate
      Barium Dichromate
      Barium Potassium Trichromate
      Barium Chlorochromate
      Barium Perchromate
      Barium Molybdate
      Barium Permolybdate
      Barium Tungstate
      Barium Uranate
      Barium Diuranate
      Barium Peruranate
      Barium Nitride
      Barium Azide
      Barium Hexammoniate
      Barium Ammonium
      Barium Amide
      Barium Amidosulphonate
      Barium Imide
      Barium Imidosulphonate
      Barium Hyponitrite
      Barium Nitroxysulphite
      Barium Nitrososulphate
      Barium Nitrohydroxylaminate
      Barium Nitrite
      Barium Nitrate
      Barium Phosphide
      Barium Dihydrohypophosphite
      Barium Hydrophosphite
      Barium Hypophosphate
      Barium Orthophosphates
      Barium Pyrophosphate
      Barium Metaphosphate
      Basic Barium Phosphates
      Barium Thiophosphites
      Barium Thiophosphates
      Barium Selenophosphates
      Barium Azophosphates
      Barium Phosphimates
      Barium Arsenide
      Barium Orthoarsenite
      Barium Pyroarsenite
      Barium Orthoarsenates
      Barium Pyroarsenate
      Barium Thioarsenites
      Barium Thioarsenates
      Barium Sodium Selenoxyarsenate
      Barium Metantimonate
      Barium Thioantimonites
      Barium Chloroantimonite
      Barium Orthothioantimonate
      Barium Hypovanadate
      Barium Vanadates
      Barium Metapervanadate
      Barium Niobate
      Barium Tantalate
      Barium Pertantalate
      Barium Carbide
      Barium Carbonyl
      Barium Formate
      Barium Acetate
      Barium Oxalate
      Barium Carbonate
      Barium Thiocarbonate
      Barium Percarbonate
      Barium Cyanide
      Barium Cyanamide
      Barium Cyanate
      Barium Cyanurate
      Barium Thiocyanate
      Barium Selenocyanate
      Barium Silicide
      Barium Silicates
      Barium Fluosilicate
      Barium Stannate
      Barium Orthoplumbate
      Barium Titanate
      Barium Peroxide Pertitanate
      Barium Pertitanate
      Barium Fluoroxytitanate
      Barium Zirconate
      Barium Boride
      Barium Borates
      Barium Fluorborate
      Barium Perborate
      Barium Aluminates
      Barium Ferrite
      Barium Ferrate
      Barium Gobaltite
      Barium Dinickelite
      Barium Platinate
    Detection of Barrium
    PDB 1djh-3iqp
    PDB 3iqr-4e7y

Barium Nitrite, Ba(NO2)2

Barium Nitrite, Ba(NO2)2, is best obtained by the decomposition of silver nitrite by barium chloride. It is also formed in other ways, for example by the action of nitrous acid vapours on barium hydroxide solution or barium carbonate, by careful calcination of the nitrate and removal of barium oxide and nitrate, or by a combination of these two methods; by reduction in the dry state by copper, cuprous oxide, oxalates, or other reducing agents; by the action of sodium nitrite on barium chloride in a limited amount of water; and by the electrolytic reduction of barium nitrate solution.

The properties of barium nitrite have been carefully examined by Oswald, and also by Ray. The anhydrous salt has a density of 3.52 at 0° C., melts at 217° C., and decomposes at 235° C. From solution it crystallises as the monohydrate in glistening, faintly yellow needles, isomorphous with the strontium salt and of density 3.109. This hydrate is stable in air, melts at 184° C. with partial hydrolysis, and may be dehydrated in vacuo over phosphorus pentoxide. It is difficult to remove all the water of crystallisation. The powdered salt dried in the steam-oven has a composition of approximately Ba(NO2)2H2O. Fock obtained the anhydrous salt in hexagonal crystals by slow evaporation.

The following values have been obtained for the solubility of the monohydrate at different temperatures: -

Temperature, °C0102030405060708090100110
Grams Ba(NO2)2.H2O in 100 grams water.63.569.579.593113136170202254461461765

The cryohydric temperature is -6.5° C., and the cryohydrate contains 34.5 per cent, of the nitrite.

The solubility of barium nitrite is diminished by alcohol, and in 90 per cent, alcohol the salt is practically insoluble. The aqueous solution has an alkaline reaction. It is stable unless acidified, when it is readily oxidised. Concentrated aqueous solutions undergo hydrolysis at 100° C.

Several double salts are known: Ba(NO2)2.2AgNO2.H2O, 2Ba(NO2)2.3Hg(NO2)2.5H2O, containing the complex bivalent anion Hg(NO2)42-, Ba(NO2)2.2KNO2, Ba(NO2)2.2KNO2.H2O, 2Ba(NO2)2.CsNO2, Ba(NO2)2.2CsNO2.H2O, Ba(NO2)2.AgNO2.3CsNO2.2H2O, and Ba[Cu(NO2)2OH]2.

© Copyright 2008-2012 by