Potassium Acetate Solution Bromate

Reagents To 40 ml of a solution containing 4 g of KCN are added 5 ml of acetic acid and 40 ml of a solution containing 3 g of potassium bromate and 4 g of potassium bromide. Concentrated sulfuric acid (4 ml) is then added dropwise and the solution is diluted with water to make its volume 100 ml. 10% sodium acetate solution acetone 0.05% solution of benzidine in ethanol containing 2% of acetic acid. 

The cobalt complex is usually formed in a hot acetate-acetic acid medium. After the formation of the cobalt colour, hydrochloric acid or nitric acid is added to decompose the complexes of most of the other heavy metals present. Iron, copper, cerium(IV), chromium(III and VI), nickel, vanadyl vanadium, and copper interfere when present in appreciable quantities. Excess of the reagent minimises the interference of iron(II) iron(III) can be removed by diethyl ether extraction from a hydrochloric acid solution. Most of the interferences can be eliminated by treatment with potassium bromate, followed by the addition of an alkali fluoride. Cobalt may also be isolated by dithizone extraction from a basic medium after copper has been removed (if necessary) from acidic solution. An alumina column may also be used to adsorb the cobalt nitroso-R-chelate anion in the presence of perchloric acid, the other elements are eluted with warm 1M nitric acid, and finally the cobalt complex with 1M sulphuric acid, and the absorbance measured at 500 nm. 

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... 

For the determination of phenoxy groups in phenoxyphenylsilanes, bomb fusion with potassium hydroxide is carried out and an aliquot of an aqueous solution of the melt is analysed for phenoxide by titration with potassium bromide-potassium bromate solution. Phenylphenoxy groups in phenyl(phenylphenoxy)silanes are similarly determined, but the melt is dissolved in anhydrous acetic acid138. 

Plating solution, chrome Potassium acid sulfate Potassum alum Potassum aluminum sulfate Potassium bicarbonate Potassium bichromate Potassium bifluoride Potassium bisulfate Potassium bisulfite Potassium bitartrate Potassium bromide Potassium carbonate Potassium chlorate Potassium chloride Potassium chromates Potassium citrate Potassium cyanate Silicone tetrachloride, dry Silicone tetrachloride, wet Silver bromide Silver chloride Silver cyanide Silver nitrate Silver sulfate Soap solutions Soda ash Sodium acetate Sodium benzoate Sodium bicarbonate Sodium bichromate Sodium bifluoride Sodium bisulfate Sodium bisulfide Sodium bisulfite Sodium borate Sodium bromate Sodium bromide Sodium carbonate... 

Ammonium acetate Potassium bromate permanent wave solutions Ammonium sulfite permanganate, mfg. 

Procedure. Dissolve 1-2 mg of the compound in 100 ml. of a solution containing 0-05 M potassium bromide and 0-08 M acetic acid in 1-0 M hydrochloric acid, and titrate with 0 02 m potassium bromate at a rotating platinum electrode on which the liberated bromine is reduced. The titration curve is as given in Fig. 47. 

The number of unsaturated bonds can be determined by a titration with a standard solution of bromine dissolved in glacial acetic acid. The sample is also dissolved in glacial acetic acid to which sodium and ammonium acetate are added, so as to give a final concentration of 0-5 and OT M respectively. The cathodic current of bromine is measured with a short circuit system using a rotating platinum indicator, and a calomel or chloranil reference electrode at the potential of the reference electrode. Several unsaturated open chain compounds and terpenes have been titrated in this way.( ) Other modifications of this technique have been used to determine the amount of unsaturation in fats in methanolic solutions. The standard solution of bromine is prepared in methanol, saturated with sodium bromide, and the methylester of stearic acid is added to suppress the maxima. If the methanolic solution is acidified, OT M potassium bromate with OT M sodium bromide can be used instead of bromine. The bromine generated in homogeneous solution can be used to analyse xylenol and cresol fractions of coal-tars. Other phenolic compounds may be similarly determined. The method was used for the determination of small concentrations of styrene... 

Preparation by reaction of potassium bromate and bromide on 2,4-diethyl-6-hydroxyacetophenone in solution of acetic acid-carbon tetrachloride mixture (quantitative yield) [2965],... 

Preparation by adding a solution of 5-tert-butyl-2-hydroxy-propiophenone in an acetic acid and hydrochloric acid (d = 1.19) mixture to an aqueous solution of 0.2 N potassium bromate and potassium bromide, then stirring 24 h after the addition of ketone (97%) [7560,7561]. 

For the determination of acetanilide, to an aliquot part of the filtrate from the iodide precipitation add sodium sulphite and sodium bicarbonate in slight excess add 2 drops of acetic anhydride and extract with three 60-ml portions of chloroform. Evaporate the chloroform to low bulk, add 10 ml of dilute sulphuric acid and evaporate the rest of the chloroform. Add 20 ml of water and digest on a water-bath for one hour. Add 10 ml of concentrated hydrochloric acid and titrate with 0 1 N potassium bromate-bromide, adding the volumetric solution very slowly to the well-shaken mixture until a faint yellow colour remains. Standardise the bromate-bromide solution against pure acetanilide. 

Reagents To a solution (40 ml) containing 4 g of KCN 5 ml of acetic acid are added followed by 40 ml of a solution containing 3 g of potassium bromate and 4g of KBr. Then 4 ml of cone, sulfuric acid are added dropwise and under cooling and the mixture is made up with water to 100 ml. 1% pyridine in water acetic acid. 

Solutions of lead acetate and potassium bromate precipitate the less soluble lead bromate. It is possible for the double salt Pb(Br03)2.Pb(OCOCH3)2 to be formed in this preparation, and this double salt explodes violently at about 165°, or even at room temperature upon percussion. Two fatal accidents have occurred by explosions of Pb(Br03)2 due to the double salt impurity present, and lead(II) bromate prepared in this way should be treated with extreme carei s. An alternative synthesis involves treatment of lead carbonate with bromic acid to form Pb(Br03)2. H20124. 

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