Potassium Ferrocyanide Iodide

R. H. Robinson found sodium nitrite to be unsuitable as a fertilizer, particularly in acid soils, owing to losses of nitrogen by decomposition. According to C. Marie and R. Marquis, nitrous acid is liberated from aq. soln. of the alkali nitrites by carbon dioxide, so that a strip of potassium iodide-starch paper suspended over the liquid is coloured blue. 0. Baudisch found that the reduction of nitrite by potassium ferrocyanide and oxygen is sensitive to light. M. Oswald found that the presence of sodium sulphate lowers the solubility of sodium nitrite enormously— at 16°, a sat. soln. of the nitrite alone has 81-6 per cent. NaN02, but a sat. soln. of both salts together has 11-8 per cent, sodium sulphate, and 53-9 per cent, of sodium... 

Aurous cyanide forms yellow, microscopic laminae, very slightly soluble in Water. It is more stable than aurous iodide, but at red heat is decomposed into gold and cyanogen. Its insolubility renders it immune to the action of dilute acids and hydrogen sulphide, but solutions of ammonia, potassium hydroxide, ammonium sulphide, and sodium thiosulphate dissolve it, probably forming complex derivatives. In aurous cyanide the tendency to form complex compounds is much more marked than in the corresponding chloride, bromide, and iodide.3 Its interaction with potassium ferrocyanide has been studied by Beutel.4... 

Other primary standards are pure electrolytic iron Fe(II) ammonium sulfate, FeS04-(NH4)2S04-6H20 potassium ferrocyanide, K4[Fe(CN)g] 3H20 and potassium iodide. Permanganate often is used without an indicator since a 2 x 10" M solution has a discernible pink color. 

II. The albuminoids are precipitated in an insoluble form by 1, the concentrated mineral acids, notably HNOs 2, by potassium ferrocyanid in presence of acetic acid 3, by certain organic acids in the presence of cpncentrated solutions of NaCl or Na SO< 4, by tannin in acid solution 5, by phosphomolybdic or phospho-tungstic acid 0, by double lodid of potassium and mercury, or double iodid of potassium and bismuth, in acid solution 7, by solutions of the salts of Pb, Cu, Ag, Hg, U 8, by chloral, picric acid, phenol or trichloracetic acid. 

White precipitates are formed when a 1% solution of cusparine is treated with phosphotungstic, phosphomolybdic or tannic acids, or with mercuric chloride or potassium mercuri-iodide. Picric acid, platinic chloride or potassium chromate give yellow precipitates, auric chloride or potassium bismuth iodide brown, and potassium ferrocyanide bluish-white (36). By treating a solution of cusparine hydrobromide with bromine water, a series of bromocusparine polybromides is obtiuned(38). 

IP s oxidation processes directly affecting the imidazole and pyridine rings were seldom observed. But oxidation of 1,3-dimethyl-IbP iodide and other salts of a similar structure by potassium ferrocyanide in alkaline medium at temperatures below 10 °C afforded 1,3-disubstituted IbP-2-one (68KG954) (Section IV.C.l). 

Stationary Phase Silica gel O (E. Merck, India). Mobile Phase 1.0 M sodium formate + 1.0 M potassium iodide (1 9). Conditions Ascending technique, run 10 cm, layer thickness 0.25 mm, activation at I00°C for 1 h, chromatography at 30°C. Detection 0.1% solution of dithizone in carbon tetrachloride for Zn, Cd and Pb 1% alcoholic solution of dimethylglyoxime for Ni and Co 1% aqueous solution of potassium ferrocyanide for Cu. Remarks Identification, quantitative separation and recovery of Cu from spiked water and industrial waste water using TLC-AAS and TLC-titrimetric techniques. 

The test for uranium with potassium ferrocyanide can also be carried out in the presence of ferric and cupric salts, if these metals are converted, before the addition of the ferrocyanide, into the nonreacting cuprous and ferrous forms. Reduction with iodide ions in acid solution serves this purpose ... 

Procedure. A drop of concentrated potassium iodide solution is placed on filter paper and, after it has soaked in, a drop of the acid test solution is added iodine is liberated. To complete the reduction, a further drop of potassium iodide is added, and then a drop of sodium thiosulfate to remove the elementary iodine. A drop of potassium ferrocyanide is placed on the decolorized fleck. A more or less deeply colored brown or yellowish circle is formed, according to the amount of uranium present. 

Potassium Acetate Potassium Acid Sulfate Potassium Acid Tartrate Potassium Antimonate Potassium Bicarbonate Potassium Bichromate Potassium Bisulfate Potassium Bisulfite Potassium Bitartrate Potassium Borate Potassium Bromate Potassium Bromide Potassium Carbonate Potassium Chlorate Potassium Chloride Potassium Chromate Potassium Cyanide Potassium Dichromate Potassium Ferricyanide Potassium Ferrocyanide Potassium Fluoride Potassium Hexacyanoferrate (III) Potassium Hydrogen Carbonate Potassium Hydrogen Sulfate Potassium Hydrogen Sulfite Potassium Hydroxide Potassium Hypochlorite Potassium Hyposulfite Potassium lodate Potassium Iodide Potassium Manganate Potassium Nitrate Potassium Perborate Potassium Perchlorate Potassium Permanganate Potassium Peroxydisulfate Potassium Persulfate... 

Uses Of the Stassfurt salts.—The magnesium compounds in the Stassfurt salts are used for the preparation of magnesium and of its salts. The potash salts are an essential constituent of many fertilizers used in agriculture, etc. 22 and potassium chloride is the starting-point for the manufacture of the many different kinds of potassium salts used in commerce—carbonate, hydroxide, nitrate, chlorate, chromate, alum, ferrocyanide, cyanide, iodide, bromide, etc. Chlorine and bromine are extracted by electrolysis and other processes from the mother liquids obtained in the purification of the potash salts. Boric acid and borax are prepared from boracite. Caesium and rubidium are recovered from the crude carnallite and sylvite. 

H. Stamm also measured the solubilities of the salts of the alkalies in liquid ammonia —potassium hydroxide, nitrate, sulphate, chromate, oxalate, perchlorate, persulphate, chloride, bromide, iodide, carbonate, and chlorate rubidium chloride, bromide, and sulphate esesium chloride, iodide, carbonate, and sulphate lithium chloride and sulphate sodium phosphate, phosphite, hypophosphite, fluoride, chloride, iodide, bromate, perchlorate, periodate, hyponitrire, nitrite, nitrate, azide, dithionate, chromate, carbonate, oxalate, benzoate, phtnalate, isophthalate ammonium, chloride, chlorate, bromide, iodide, perchlorate, sulphate, sulphite, chromate, molybdate, nitrate, dithionate, thiosulphate, persulphate, thiocyanate, phosphate, phosphite, hypophosphite, arsenate, arsenite, amidosulphonate, ferrocyanide, carbonate, benzoate, methionate, phenylacetate, picrate, salicylate, phenylpropionate, benzoldisulphonate, benzolsulphonate, phthalate, trimesmate, mellitate, aliphatic dicarboxylates, tartrate, fumarate, and maleinate and phenol. 

The chemical dosimeter that is used most frequently is the thiocyanate dosimeter [119]. Other chemical dosimeters for pulse radiolysis are ferrocyanide [119], modified Fricke (Super-Fricke) [119], hydrated electron [120], 02-saturated solutions of potassium iodide [112], and N20-saturated solutions of methylviologen and formate [118]. The C(N02)4 (tetranitromethane, TNM) dosimeter is used in pulse radiolysis experiments with simultaneous optical and conductometric detection [121-124]. The composition and characteristics of the various chemical dosimeters used for pulse radiolysis with optical detection are listed in Table 8. 

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