Calcium potassium ferrocyanide

Calcium ammonium ferrocyanide, (NH4)2CaFe(CN)6, results on mixing cold concentrated solutions of calcium chloride and ammonium ferrocyanide, in equimolecular proportions, washing the precipitate and drying in air or at 100° C. It also results on boiling potassium calcium ferrocyanide (see p. 219) with water containing a large excess of ammonium chloride.7... 

Potassium calcium ferrocyanide, K2CaFe(CNT)6, is obtained by mixing cold concentrated solutions of potassium ferrocyanide and calcium chloride in molecular proportions. The precipitate is washed in cold water and dried m air or at 100° C. 

Potassium calcium carbonyl ferrocyanide, CaK.Fe(CN)5.C0.5H20, has been obtained as straw-coloured crystals.5... 

Yellow prussiate of calcium Yellow prussiate of lime. See Calcium ferrocyanide Yellow prussiate of potash. See Potassium ferrocyanide... 

Sodium diisobutyl dithiophosphate Sodium diisopropyl dithiophosphate Sodium di-(methylamyl) dithiophosphate Stearyl hydroxyethyl imidazoline flotation collector, zinc sulfide ore Sodium di-s-butyl dithiophosphate flotation depressant Acacia Calcium ferrocyanide Carboxymethylcellulose sodium Hydrofluoric acid Potassium ferricyanide Potassium ferrocyanide Sodium metabisulfite flotation depressant, copper ores Dicyandiamide Guanidine nitrate 2-Mercaptoethanol Phosphorus pentasulfide Quinolinic acid... 

Potassium ferrocyanide and ammonium salts produce calcium potassium ammonium ferrocyanide of varying composition. Compare F. Flanders, J. Am, Chem. Soc. 28 (1906) 1609. 

Ammonium cyanide may be prepared in solution by passing hydrogen cyanide into aqueous ammonia at low temperatures. It may also be prepared from barium cyanide and ammonium sulfate, or calcium cyanide with ammonium carbonate. It may be prepared in the dry state by gentiy heating a mixture of potassium cyanide or ferrocyanide and ammonium chloride, and condensing the vapor in a cooled receiver. Ammonium cyanide is soluble in water or alcohol. The vapor above soHd NH CN contains free NH and HCN, a very toxic mixture. 

Several types of corrosion inhibitors have been investigated in the last 20 years [53-55] these include calcium and sodium nitrites, sodium benzoate, sodium/potassium chromate, sodium salts of silicates and phosphates, stannous chloride, hydrazine hydrate, sodium fluorophosphate, permanganate, aniline and related compounds, alkalis, azides, ferrocyanide, EDTA and many chelating compounds. However, in terms of field practice and research data, nitrite-based compounds occupy a dominant position. 

The formula for potassium arsenate is K3As04. The formula for potassium ferrocyanide, systematically called potassium hexacyanoferrate(II), is K4Fe(CN)g. Write the formulas for (a) calcium arsenate ib) iron(III) arsenate ... 

Uses cyanide salts are used in silver and gold mining—the cyanide process sodium cyanide is extensively used in industries for electroplating calcium cyanide is used as a fumigant potassium silver cyanide is used in silver plating potassium ferrocyanide is used to achieve a blue color on cast bronze sculptures... 

Copper, Nitric Acid, etc. (Alkali Salts, Calcium). — Dilute 20 iM. of ferric chloride solution (1 1) with 100 cc. of water, fuld 25 cc. of ammonia water, and filter. On evaporating 50 cc. of the colorless filtrate and igniting the residue, the weight of the latter should not exceed 0.001 gm. On mixing 2 cc. of the filtrate with 2 cc. of concentrated sulphuric acid, and overlaying tliis mixture with 1 cc. of ferrous sulphate solution, no brown zone should form at the contact-surfaces of the two licpiids. 20 cc. of the filtrate acidulated With acetic a

potassium ferrocyanide solution. 

Until a few years ago, hydrocyanic acid was always prepared by heating potassium ferrocyanide with dilute sulphuric acid. Nowadays, it is preferred to employ the alkali cyanides, either sodium or potassium, as these are manufactured synthetically on a large scale and very cheaply. Usually 50% aqueous sulphuric acid is run on to sodium cyanide either in concentrated solution or in lumps, and then the mixture heated in order to drive off the hydrocyanic acid. As it is evolved, the acid is dried by passing through calcium chloride and then liquefied by passing it first... 

For acute toxicity, emesis is recommended. Treatment is symptomatic. A combination of BAL (British AntiLewisite 2,3-dimercaptopropanol) and calcium-ethylene diamine tetraacetic acid has been used successfully in a poisoned infant. Penicillamine has also been used. Recently, oral administration of 2,3-dime-rcaptol-propane sulfonate was found to be effective in experimental rodents. Electrolyte balance must be maintained when gastric lavage is indicated. Potassium ferrocyanide should be added to precipitate the copper. 

To Obtain Aimydrous Prussic Acid. Pure crystallized ferrocyanide of potassium, 15 parts water and sulphnric acid, of each 9 parts distill in a gloss retort into a Well-cooled receiver, containing chloride of calcium in coarse fragments, o parts stop tho process as soon as the chloride in the receiver is perfectly covered by the distilled fioid, and decant the acid into a bottle for-uished with a good stopper. Keep it in the dark, with the bottle inverted. 

FIG. 13 The hydrogenosome of T. foetus. A thin section was stained with glutaraldehyde-osmiura tetroxide—potassium ferrocyanide in the presence of 5mMCaCl2- Note the two closely apposed membranes of the hydrogenosome (H), and the electron-dense product which localizes between the two membranes (asterisk), suggesting the presence of intrahydrogenosomal calcium. (Reprinted with permission from ref 84.)... 

Fliminating the excess iron using potassium ferrocyanide for white wines and calcium... 

Potassium ferrocyanide treatment is restricted to white and rose wines, at least in France. Excess iron is eliminated from red wines using calcium phytate. 

Citric acid (Section 4.6.3), gum arable (Sections 4.6.3, 9.4.3), ascorbic acid (Section 4.6.4 and Volume 1, Section 9.5.3), potassium ferrocyanide (Section 4.6.5), calcium phytate (Section 4.6.6)... 

Moseley devised an apparatus which enabled the X-rays generated by firing electrons at a metallic target in a cathode ray tube to be diffracted by a crystal of potassium ferrocyanide and the resulting spectral lines to be recorded photographically. Moseley found that each element produced its own characteristic set of X-ray lines, and he commented that the method makes the analysis of X-rays as simple as any other branch of spectroscopy. In his first paper Moseley measured the frequencies of one of the characteristic lines in the X-ray spectra of the elements from calcium to zinc (with the exception of scandium). He found that the frequency of the lines was proportional to Q, where Q increased by a constant amount between consecutive elements when ordered according to the periodic table. Moseley continued ... 

The addition of 0.25-2.0% calcium or magnesium carbonate, calcium silicate, or silicic acid improves the flowability. Indeed, 20 ppm of potassium ferrocyanide prevents the formation of lumps in the salt. The latter compound modifies the crystallization process of NaCl during the evaporation of salt spring water. In the presence of potassium ferrocyanide, the salt builds dendrites, which have strongly reduced volume, density and inclination to agglomerate. 

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