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 Cyanide, Ba(CN)2

Barium Cyanide, Ba(CN)2, is formed by passing anhydrous hydrocyanic acid over cooled barium hydroxide crystals, and dissolves in the water of crystallisation of the hydrated baryta. With anhydrous barium oxide or hydroxide too vigorous a reaction takes place and the cyanide is decomposed. Prismatic crystals of the dihydrate, Ba(CN)2.2H2O, may be obtained by adding a slight excess of hydrocyanic acid and evaporating in vacuo in presence of sulphuric acid and a small quantity of caustic potash. They are deliquescent and readily decomposed by the carbon dioxide of the air. Over sulphuric acid in vacuo the more stable monohydrate is obtained, and this may be completely dehydrated by a slow current of dry air, first at 75° C., and then at 100° C. The anhydrous salt is white and very hygroscopic. It is also very soluble in water, eight parts dissolving in ten of water, and fairly soluble in alcohol. The heat of hydration to the monohydrate is 1.94 Cal., and to the dihydrate 3.17 Cal.

Barium cyanide is also formed by the action of carbon monoxide on barium nitride, by the calcination of barium ferrocyanide and extraction with water, and by the action of cyanogen gas on barium amalgam. Pure barium cyanide may be prepared by suspending finely powdered barium hydroxide in light petroleum and adding an emulsion of anhydrous hydrocyanic acid in light petroleum. It fuses at about 600° C. and is rather volatile.

By passing nitrogen over barium carbide heated to redness in iron retorts, about 30 per cent, of the carbide is converted into cyanide, the rest forming barium cyanamide. By fusing with sodium carbonate the remainder of the carbon is taken up and cyanide formed.

When the cyanide is heated to 300° C. in the presence of steam the whole of the nitrogen is evolved in the form of ammonia, leaving barium formate,

Ba(CN)2 + 4H2O = Ba(HCOO)2 + 2NH3.

The compound Ba(CN)(OCH3).CH3OH is obtained when hydrocyanic acid is passed into a methyl alcohol solution of barium oxide. It loses alcohol at 100° C., and at still higher temperatures forms the basic cyanide, BaO.Ba(CN)2.

Aqueous solutions of barium cyanide dissolve insoluble cyanides of some of the heavy metals forming crystalline double salts - for example, BaHg(CN)4.3H2O in needles, 2Ba(CN)2.3Hg(CN)2.23H2O in transparent octahedra, and Ba(CN)2.Hg(CN)2.HgI2.6H2O; barium manganocyanide, Ba2Mn(CN)6, barium manganicyanide, Ba3[Mn(CN)6]2, barium manganese manganocyanide, BaMn[Mn(CN)6], and also a double manganocyanide of barium and potassium; barium cobaltocyanide, Ba2Co(CN)6, and an unstable barium chromocyanide, and also a barium ruthenocyanide, Ba2Ru(CN)6.6H2O.

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