Potassium aluminum ferrocyanide

The formula of potassium arsenate is K3ASO4. The formula of potassium ferrocyanide [systematically called potassium hexacyanoferrate(II)] is K4Fe(CN)6. Write the formulas of (a) calcium arsenate, (b) iron(III) arsenate, (c) barium ferrocyanide, (d) aluminum ferrocyanide. 

Hydroxyethyl cellulose has good tolerance for dissolved electrolytes, although it may be salted out of solution when mixed with certain salt solutions. For example, the following salt solutions will precipitate a 10% w/v solution of Cellosize WP-09 and a 2% w/v solution of Cellosize WP-4400 sodium carbonate 50% and saturated solutions of aluminum sulfate ammonium sulfate chromic sulfate disodium phosphate magnesium sulfate potassium ferrocyanide sodium sulfate sodium sulfite sodium thiosulfate and zinc sulfate. 

Natrosol is soluble in most 10% salt solutions, excluding sodium carbonate and sodium sulfate, and many 50% salt solutions with the exception of the following aluminum sulfate ammonium sulfate diammonium phosphate disodium phosphate ferric chloride magnesium sulfate potassium ferrocyanide sodium metaborate sodium nitrate sodium sulfite trisodium phosphate and zinc sulfate. Natrosol 150 is generally more tolerant of dissolved salts than is Natrosol 250. 

The names sodium borohydride and lithium aluminum hydride (8) are not constructed on any established nomenclature pattern unless it be rapidly disappearing one represented by sodium silicofluoride and potassium ferrocyanide. 

HEXAHYDRATE (10377-60-3) A powerful oxidizer. Reacts violently with dimethyl-formamide, reducing agents, combustible materials, fuels, organic substances, metal powders, potassium hexanitrocobalite(III) (C.I. pigment yellow), sodium acetylide, and easily oxidizable matter. Incompatible with aluminum, ammonium hexacyanoferrate(II), tert-butylhydroperoxide, citric acid, ethanol, ferrocyanides, hydrazinium perchlorate, isopropyl chlorocarbonate, metal phosphinates, nitrosyl perchlorate, organic azides, phosphorus, sodium thiosulfate, sulfamic acid, thiocyanates, tin(II) fluoride, and many other substances. 

Iron, uranium, chromium and manganese form colored alizarin lakes and, therefore, interfere in the Al-alizarin test. In some cases, the interference can be eliminated by precipitation as ferrocyanides. Thus, when the precipitation is carried out on filter paper impregnated with potassium ferrocyanide, the aluminum salt diffuses through the capillaries to the water zone encircling the fleck of precipitate and can be detected there by the alizarin reaction. 

The following should be noted with reference to the detection of aluminum in the presence of other metals When much iron is present, it may happen that the potassium ferrocyanide in the paper in the area of the drop is insufficient to bind all the iron. When the fleck is then moistened with the wash water, unchanged ferric chloride diffuses outward, extends the Prussian blue fleck, and renders the detection of the aluminum difficult. It is best to use very small drops, so that the fleck is at most 5 mm in diameter, and also to carry out a comparative test on an iron solution under exactly the same conditions on the same paper. The difference is then quite easy to see. 

In detecting a small amount of aluminum in the presence of much iron and chromium, a control test should be carried out on an aluminum-free iron-chromium solution. After addition of the alizarin, the paper should be placed in hot water for 1 minute and then dried. The potassium ferrocyanide is removed, and the paper becomes white. The lake coloris thus renderedmore visible. The control flecks show only a very slight color change, if any, because the chromium ferrocyanide is also washed away. The concentrations... 

Alkali ferricyanides oxidize acid solutions of diethylaniline and other aromatic amines, as well as certain monoazo dyestuffs a change of color results and ferrocyanide is formed. This reversible redox reaction, proceeds very slowly and incompletely. However, if the ferrocyanide ions are removed as insoluble white zinc ferrocyanide, the oxidation proceeds rapidly. This acceleration is a result of raising the oxidation potential of ferricyanide ions through removal of ferrocyanide ions. The white zinc ferrocyanide is deeply tinted by adsorption of the colored quinoidal oxidation products of the amines, and thus affords a sensitive test for zinc. The test is especially useful in the presence of chromium and aluminum. It can also be used in other instances provided no other cations are present, which form colored precipitates with potassium ferrocyanide (Co+, Ni+, Fe+, Mn+ , Cu+ ). Traces of iron, which in practice are always to be reckoned with, do not interfere with the zinc test. Anions which oxidize the amines must be absent, e.g., permanganate, chromate, vanadate, persulfate, iodate. 

A drop of the test solution is placed on dry filter paper that has been impregnated with potassium ferrocyanide. Any iron or chromium is held back in the paper, while the aluminum diffuses through the capillaries and accumulates in a circular zone. A drop of a saturated alcoholic solution of alizarin is added and the paper is held over ammonia. The violet color of ammonium alizarinate then appears. In the presence of considerable amounts of aluminum, the strawberry red of the aluminum alizarinate can be seen at the same time. For smaller amounts the filter paper is warmed (held briefly near a flame or placed in an oven) and the violet ammonium alizarinate decomposes (volatilization of ammonia). The red aluminum lake then becomes clearly visible. 

Ammonia synthesis catalysts of high activity, prepared from alkali metal, e.g., potassium, ferrocyanide with the addition of uranium, aluminum, and/or rare-earth metal. V. S. Badik, V. V. Dovgel, and A. N. Sergeeva. SU 357783 (1979). 

Sodium ferrocyanide Fe(CN)5Na4-12H20 and potassium ferrocyanide Fe(CN)6K4-3H20, as well as sodium ferricyanide Fe(CN)gNa3 H20 and potassium ferricyanide Fe(CN)gK3, dry or in solution, have no action on aluminum, even at 100 °C. In a solution at 10% ferrocyanide, the decrease in thickness is 10 xm per year for 1100 and 5754. 

Butyl Lactate Lactic Acid Butyl Ester Dipentene p-Menthadiene Aluminum Acetate Potassium Ferrocyanide Butyl Acetyl Ricinoleate... 

Eastman 910 Potassium Ferricyanide Potassium Hexacyanoferrate (III) Calcium Bisulfite Calcium Nitrite Ammonium Fluoroborate Limonene Aluminum Acetate Potassium Ferrocyanide 2-Aminobutane sec-Butylamine Benzyl Acetate Phenylmethylacetate Ferrous Nitrate Iron (II) Nitrate... 

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