Potassium ferrous carbonate

Ferrous potassium carbonate, FeK2(C03)2.4H20, may be prepared by mixing, out of contact with air, a concentrated solution of ferrous chloride with excess of potassium carbonate. At first a white precipitate of ferrous carbonate is formed, which soon dissolves to a greenish solution from which the double salt crystallises in nearly white scales.4... 

Ferro-hydroxyd, n. ferrous hydroxide, iron(II) hydroxide, -ion, n. ferrous ion. -jodid, n. ferrous iodide, iron(II) iodide, -kaliumsul-fat, n. ferrous potassium sulfate, -karbonat, n. ferrous carbonate, -legierung, /. ferroalloy. 

In general, ferrous alloys are difficult to dissolve with acids so that a fusion, for example with sodium/potassium carbonate, is recommended. The resulting high salt concentration can produce difficulties (viscosity, nebuliser/ burner system), as is discussed in Chapter 3. Once sample solutions are available, there is no difference in analysis from the methods for iron and steel. 

Carbon dioxide decomposes potassium ferrocyanide solution at 72° to 74° C., liberating hydrogen cyanide and precipitating ferrous potassium ferrocyanide.2 Continued passage of carbon dioxide through a boiling solution of potassium ferrocyanide results in the precipitation of ferric hydroxide and the formation of potassium carbonate and hydrogen cyanide, or its decomposition products, ammonia and formaldehyde.3... 

Complex Cyanides of Iron. Cyanide ion added to a solution of ferrous or ferric ion forms precipitates, which dissolve in excess cyanide to produce the complexes. Yellow crystals of potassium ferrocyanide, K4Fe(CN)(./3H20, are made by heating organic material, such as dried blood, with iron filings and potassium carbonate. The mass produced by the heating is extracted with warm water, and the crystals are made by evaporation of the solution. Potassium ferricyanide, K3Fe(CN), is made as red crystals by oxidation of ferrocyanide. 

Diazotised o-nitroanilinc coupled with o-bromophenylarsenoxide yields ti-bromo-6 -iiitrodiphenylarsinic acid (I), reduction of which by ferrous liydroxide gives the amino-dcrivati c (II). This loses hydrobromic acid when heated in amyl alcohol with potassium carbonate and a little copper powder, forming phenamaziiiic acid (III). This acid, when reduced in alcoholic hydrochloric acid by sulphur dioxide, is converted into lO-chloro-5 10-dihydrophenarsazine (IV). This product is identical with the substance prepared according to the equation ... 

Salts Compounds formed by the union of acids and bases, by the action of alkalies upon metals, or by the direct union of elements. The term is often incorporated in the common name of salts used as pharmaceuticals bitter salts, epsom salt, or Seidlitz salt (magnesium sulfate), preparing salt (sodium stannate), Preston s salts (ammonium chloride), Rochelle salt or Seignette s salt (potassium and ammonium tartrate), salt of Mars (ferrous sulfate), salt of Saturn (lead acetate), salt of tartar (potassium carbonate), salt of tin (stannous chloride), salt of wisdom (mercury bichloride and ammonium chloride), sore-throat salt (fused potassium nitrate), vinegar salts (calcium acetate), and vomiting salt (zinc sulfate). The term is also applied to some acids, such as salt of lemon or sour salt (citric acid), salt of sorrel (oxalic acid), and spirit of salt (muriatic acid). ... 

Some of the old formulas call for iron turnings, some call for ferrous oxide (iron oxide or just plain rust). The point is that fused, the atoms of iron will be picked up by the potassium carbonate whether iron turnings or rust is used. Also, you can go to any junk yard and scrape off a lot of rust from old boilers, car bodies or whatever, with a lot less trouble than it takes to turn iron. Use whichever is handy. 

Ammonium phosphate Potassium carbonate — Magnesium sulphate — Ferrous sulphate.. 

The catalyst was precipitated from a warm nitrate solution (60-70°), containing ferrous and ferric ions in a ratio of approximately 1 1 and 1 % copper, by a boiling solution of sodium carbonate. After precipitation, the slurry was heated briefly to 100°C., filtered, and washed free of alkali. The catalyst was then reslurried in water and an aqueous solution of potassium carbonate (0.75%, based on iron) was carefully added with stirring. The mixture was evaporated to a paste on the water bath, and dried at 110°C. for 24 hours. The dry catalyst was crushed to granules of 2-4 mm. in size and pretreated with water gas at 325°C. and Mo atm. (4 1. gas at standard conditions per 10 g. of iron per hour). 

Chromite, FeCr204, is the principal ore of chromium. Chromates and dichromates are obtained from it by fusion with sodium or potassium carbonate with access of air the iron is oxidized from the ferrous to the ferric condition and the chro-... 

Salicylsulfonic acid. See 5-Sulfosalicylic acid Saline. See Sodium chloride Salinide. See Salicylanilide Salix alba Salix alba bark extract. See Willow (Salix alba) bark extract Salmiac. See Ammonium chloride Sal mine sulfate. See Protamine sulfate Salol. See Phenyl salicylate SALP. See Sodium aluminum phosphate acidic Sal soda. See Sodium carbonate Salt. See Sodium chloride Sal tartar. See Sodium tartrate Salt cake. See Sodium sulfate Salt of Mohr. See Ferrous ammonium sulfate Saltpeter. See Potassium nitrate Salt of Saturn. See Lead acetate Salt of tartar. See Potassium chlorate Potassium carbonate Salt of tarter. See Potassium chlorate Salt of tin. See Stannous pyrophosphate Salvia. See Sage (Salvia officinalis)... 

In a memoir on spathic iron ore (ferrous carbonate) read in June 1774, Bayen showed that the mineral on heating or dissolving in acids lost what the English call fixed air . He used Hales s apparatus, measuring the elastic fluid or gas (gaz) evolved, which he found was absorbed by fixed alkali (potassium carbonate) to form a crystalline salt (potassium bicarbonate). He concluded that the mineral is a compound of i part of fixed air or gas and 3 parts of metallic iron, but it is really a compound of i part of fixed air and i -6 of ferrous oxide. 

Copper sulfate Ferric chloride 50% aq. sol n Ferrous chloride 50% aq. sol n Lithium chloride >30% aq. sol n Mercuric chloride sat d aq. sol n Potassium acetate sat d aq. sol n Potassium carbonate Potassium chromate sat d aq. sol n Potassium iodide... 

Trace metals have to be removed, notably manganese, ferrous ions and zinc. This is often accomplished using the compound potassium hexacyanoferrate which predpitates or complexes the metals and, in excess, acts to inhibit growth and indirectly promotes dtric add production. The amount of potassium hexacyanoferrate required is variable depending on the nature of the ion content of the carbon source. 

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