Sulphuric acid potassium

The dichromate ion oxidises iron(II) to iron(III), sulphite to sulphate ion, iodide ion to iodine and arsenic(III) to arsenic(V) (arsenate). Reduction of dichromate by sulphite can be used to prepare chrome alum, since, if sulphur dioxide is passed into potassium dichromate acidified with sulphuric acid, potassium and chromium(III) ions formed are in the correct ratio to form the alum, which appears on crystallisation ... 

In water pollution studies, the oxygen content can be measured by making the water alkaline and shaking a measured volume with an oxygen-free solution containing Mn- (aq). The solution is acidified with sulphuric acid, potassium iodide added and the liberated iodine titrated with sodium thiosulphate. 

Method 2 (from potassium bromide and sulphuric acid). Potassium bromide (240 g.) is dissolved in water (400 ml.) in a litre flask, and the latter is cooled in ice or in a bath of cold water. Concentrated sulphuric acid (180 ml.) is then slowly added. Care must be taken that the temperature does not rise above 75° otherwise a little bromine may be formed. The solution is cooled to room temperature and the potassium bisulphate, which has separated, is removed by flltration through a hardened Alter paper in a Buchner funnel or through a sintered glass funnel. The flltrate is distilled from a litre distilling flask, and the fraction b.p. 124 127° is collected this contains traces of sulphate. Pure constant boiling point hydrobromic acid is obtained by redistillation from a little barium bromide. The yield is about 285 g. or 85 per cent, of the theoretical. 

Aspila et al. [60] have described a semi-automated method for the determination of inorganic, organic and total phosphorus in river and lake sediments. Total phosphorus is extracted from sediments with 1M hydrochloric acid after ignition at a high temperature (550°C) (method 1) or by digestion with sulphuric acid-potassium persulphate at 135°C in a sealed PTFE-lined Parr bomb (method 2). 

Analysis of the Ash.—The usual determinations are those of the sulphuric acid, potassium (calculated as oxide), phosphoric acid and chlorine,... 

It was found that the application of certain strong oxidizing solutions would make polyolefins receptive to inks and adhesives, and Horton5 suggested the use of a strong sulphuric acid-dichromate solution. Later, Ziccarelli6 described a similar process in which a moulding could be treated by immersion in a sulphuric acid-potassium chromate solution. 

If, however, a solution of potassium platinocyanide is treated with hydrogen peroxide (20-volume solution) acidulated with dilute sulphuric acid, potassium platinicyanide, KPt(CN)4, is obtained, united with three molecules of platinocyanide, thus 8K2Pt(CN)4.KPt(CN)4.6H20. Lithium platinocyanide is more readily oxidised in this manner, yielding 2Li2Pt(CN) 4. LiPt(CN)1 and if the hydrogen peroxide is replaced by Merck s pure perhydrol, complete oxidation to lithium platinicyanide, LiPt(CN)4, is obtained. 

Cyanide. This should have been detected and confirmed in the preliminary test with dilute sulphuric acid (Prussian blue test or as Section IV.8, reaction 1). Sulphite. This anion will have been detected in the preliminary test with dilute sulphuric acid (potassium dichromate paper or fuchsin solution test). Hexacyanoferrate(II) (and Thiocyanate). Acidify 1 ml of the soda extract with dilute hydrochloric acid and add a few drops of iron(III) chloride solution. A deep-blue precipitate indicates hexacyanoferrate(II) present. Now add 0-5-1 ml iron(III) chloride solution, 0-2 g sodium chloride and half a Whatman filtration accelerator, shake the mixture vigorously and filter. A deep-red filtrate indicates thiocyanate present. 

Potassium Dichromate, KjCcjO, may be prepared from the sodium salt and potassium chloride, or by a direct method. In the latter ease, chrome iron ore (p. 7) is calcined in the air with calcium carbonate, and the mass extracted with water containing a little sulphuric acid. Potassium carbonate is then added, and, after filtration and addition of sulphuric acid, the potassium dichromate is separated by fractional crystallisation. An alternative method consists in heating chromite with calcium carbonate and potassium sulphate, and lixiviating the mass with water. Oxidation of chromite by means of fused potassium nitrate is sometimes convenient, especially upon a small scale. Potassium dichromate is formed by the addition of any acid to a solution of potassium chromate (see p. 4.4 ). ... 

According to Dr. Osada, potassium chlorate reacts with hydrochloric acid to produce chlorine dioxide, C102-,and chlorine, Cl, where the latter reduces the explosive tendency of the former. And in this case it is as dangerous as it is with sulphuric acid. Potassium chlorate does not react with nitric acid, but if there is potassium chloride in the potassium chlorate, it causes a violent reaction with the generation of chlorine dioxide. Accordingly, the amount of potassium chloride as an impurity is significant. Potassium chlorate reacts with phosphoric acid less violently than with hydrochloric acid, but it also generates chlorine dioxide. 

Al, Si, P Digestion with diethyl ether-concentrated sulphuric acid-potassium persulphate. Silicon determined gravimetrically. Aluminium determined by titrimetric EDTA method. Phosphorus determined by spectrophotometric molybdenum blue method. 

Arcanum duplicatum Caswell No. 702 Dipotassium sulfate EINECS 233-558-0 EPA Pesticide Chemical Code 005603 Glazier s salt HSDB 6047 Kalium sulphuricum Potassium sulfate Potassium sulphate Sal Polychrestum Sulfuric acid, dipotassium salt Sulphuric acid, potassium salt Tartarus vitriolatus. Analytical reagent, medicine (cathartic), gypsum cements, fertilizer, manufacture of alum and glass, food additive. Registered by EPA as a herbioide and insecticide. Colorless, hard crystals, mp = 1067° d = 2.66 soluble in H2O (12 g/100 ml at 25°, 25 g/100 ml at 100°),... 

Discussion The rate at which most reactions take place is approximately doubled for an increase in temperature of ten degrees. In the experiment described below determinations at two temperatures are made of the time required to reduce a solution of potassium permanganate by means of iron and sulphuric acid. Potassium permanganate has a purple color and is converted by reduction into a colorless compound. All the conditions except the temperature are kept constant by using equal volumes of the same solution in test tubes of the same size the iron is used in the form of nails so that the surface of the metal in each case is the same. 

Some of the more important preservatives used in foods are benzoate of soda, boric acid, salicylic acid, alcohol, formaldehyde, sulphuric acid, potassium nitrate or saltpeter. 

Kode of Preparation.—By distilling a mixture of potassium (or sodium) nitrate and concentrated sulphuric acid potassium-hydrogen sulphate remains in the retort, and nitric add distils over. 

Mercaptans — Sulpho compounds — Sodium isethionate — Methyl-sulphuric acid—Potassium-trichlorrmethyl sulphate — Potassium-trichlor-methyl sulphonate — Ethyl-sulphuric acid—Potassium-isoamyl sulphate—Potassium xanthate—Dimethyl-dithiocarbamic acid.47 49... 

B-Z reaction (Belousov-Zhabotinskii reaction) A chemical reaction that shows a periodic colour change between magenta and blue with a period of about one minute, it occurs with a mixture of sulphuric acid, potassium bromatefV), cerium sulphate, and... 

Okra bast Water retting Scouring Bleaching Acetylation Sulphuric acid Potassium permanganate Dodecyl sulphate Chemical,tensile, thermal properties, water absorption 15... 

It is based primarily on the dissolution of zirconium in a mixture of sulphuric acid, potassium periodate and sodium fluoride. The carbon is extracted in the form of carbon dioxide and hydrocarbons. The latter are then oxidized by passing the gases through a column containing copper oxide fixed on alumina at 800°C. 

EleclTolyte potassium hydroxide potassium hydroxide sulphuric acid sulphuric acid potassium hydroxide potassium hydroxide potassium hydroxide... 

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