Potassium Ferrocyanide Permanganate

By adding sulphuric acid to a portion of the clear solution and estimating the excess of potassium ferrocyanide by titration with permanganate, the method may be made a convenient one for the estimation of zinc.13... 

The salt is more stable than potassium ferrocyanide towards oxidising media, being unaffected by potassium persulphate, and but slightly oxidised by permanganate or ozone in the absence of sulphuric acid.5 The salt becomes anhydrous at 120° C. The heats of solution are as follow —6... 

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. 

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. 

Iron percfiloride and potassium sulphocyanide give a blood-red, decolourized by mercuric chloride potassium sulphocyanide and sulphuric acid a fine old port colour, cleared by the same agent Litmus solution and an acid produce red, also permanganate of potash and sulphuric acid, cleared by hyposulphite of soda. Potassium ferrocyanide and the double sulphate of uranium and potassium give an old port-like colour-washing soda clears it. 

DEKTAL DEVELOPER KODAK FIXER KODAK SHORT STOP POTASSIUM ALUM POTASSIUM BICARBONATE POTASSIUM BICHROMATE POTASSIUM BORATE POTASSIUM BROMATE POTASSIUM BROMIDE POTASSIUM CARBONATE POTASSIUM CHROMATE POTASSIUM CHLORATE POTASSIUM CHLORIDE POTASSIUM CYANIDE POTASSIUM DICHROMATE POTASSIUM FERRICYANIDE POTASSIUM FERROCYANIDE POTASSIUM FLUORIDE POTASSIUM HYDROXIDE POTASSIUM NITRATE POTASSIUM PERBORATE POTASSIUM PERCHLORATE POTASSIUM PERMANGANATE. 10% POTASSIUM SULFATE PROPANE PROPANE GAS PLATING SOLUTIONS BRASS CADMIUM COPPER GOLD INDIUM LEAD NICKEL RHODIUM SILVER TIN ZINC... 

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... 

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. 

There are several salts that behave in this way at atmospheric temperatures, the more important being ammonium acetate potassium bromate, carbonate, cyanide, ferricyanide, ferrocyanide, iodate, and permanganate disodium hydrogen phosphate and sodium borate and carbonate.4 In the case of potassium chlorate the points L and S appear to be practically coincident, whilst for the majority of salts the point S lies somewhere to the left of L, namely at S —that is to say, saturation occurs before the limiting concentration is reached. Generally speaking, at the ordinary temperature, concentrated solutions of salts are less corrosive than distilled water—that is, the point S lies below the level of A, exceptions being 5 ammonium sulphate, aluminium... 

Neutral potassium permanganate is without action on the salt. Sodium amalgam7 reduces it to sodium ferrocyanide and ammonia. Thus... 

Potassium hydroxide, like its sodium counterpart, is a versatile intermediate in the production of chemicals. Because KOH is more expensive, NaOH dominates in large-scale uses, and potassium chemicals are largely restricted to specialty markets. They are often more soluble and more reactive than the corresponding sodium chemicals, and this fact is responsible for many of their applications. Widely used derivatives include acetate, bicarbonate, bromide, cyanide, ferrocyanide, oxalate, permanganate, and phosphate. The derivative with the greatest market probably is potassium carbonate, which is discussed in Section 7.5.2.2A. 

Other inorganic crystals studied 1 Mark and his collaborators, sometimes leading to complete structure determinations, included strontium chloride, zinc hydroxide, tin tetraiodide, potassium chlorate, potassium permanganate, and ammonium ferrocyanide. Minerals... 

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