The chemical analysis of iron: a complete account of all the best known methods for the analysis of iron, steel, pig-iron, iron ore, limestone, slag, clay, sand, coal, coke, and furnace and producer, gases

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J.B. Lippincott Company, 1906 - 318 Seiten
 

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Seite 286 - HC1 (1 : 3), allowing the solution to run back into the beaker in which the precipitation was made. Wash the filter with hot water. Boil the solution for 10 minutes to drive off any chlorine and reprecipitate by...
Seite 292 - Gas must not be used, because of the sulphur that it contains. The mixture is frequently stirred with a platinum wire and the heat raised very slowly, especially with soft coals. The flame is kept in motion and barely touching the dish, at first, till strong glowing has ceased, and is then increased gradually till, in fifteen minutes, the bottom of the dish is at a low, red heat.
Seite 208 - Dissolve 35 grammes of potassium iodide in a small quantity of distilled water, and add a strong solution of mercuric chloride little by little, shaking after each addition, until the red precipitate formed dissolves. Finally the precipitate formed will fail to dissolve, then stop the addition of the mercury salt and filter. Add to the filtrate 120 * Communicated to the author.
Seite 278 - ... acidulate with hydrochloric acid, and evaporate to dryness in the air-bath. Treat the mass with water and a little hydrochloric acid, evaporate again to dryness, and treat with 15 cc hydrochloric acid and 45 cc water. Allow it to stand in a warm place for fifteen or twenty minutes, add 50 cc water, and stand in a warm place for fifteen or twenty minutes, add 50 cc water, and filter on an ashless filter. Wash thoroughly with hot water acidulated with a few drops of hydrochloric acid, dry, ignite,...
Seite 208 - ... of nitrogen. Distilled Water free from Ammonia. If the ordinary distilled water contains ammonia, redistil it, reject the first portions coming over, and use the subsequent portions, which will be found free from ammonia. Several glass cylinders of colorless glass of about 160 cc capacity are also required. The best form of distilling apparatus consists of an Erlenmeyer flask of about 1500 cc capacity, with a rubber stopper, carrying a separatory funnel-tube and an evolution-tube, the latter...
Seite 289 - The flame should be fully 20 cm. high when burning free, and the determination should be made in a place free from draughts. The upper surface of the cover should burn clear, but the under surface should remain covered with carbon. To find " volatile combustible matter " subtract the per cent of moisture from the loss found here.
Seite 105 - I gramme of phenolphthalein in 500 cc of 95 per cent. alcohol. Standard Solution of Sodium Hydroxide. — To 100 grammes pure sodium hydroxide add an amount of water just insufficient to completely dissolve it. Pour it into a tall cylinder, close the cylinder and allow the insoluble matter, sodium carbonate, etc., to settle. The clear liquid will be practically free from carbonate. Dilute it in the proportion of 30 cc to 2 litres of water. Standard Nitric Acid. — Measure 2 litres of water into...
Seite 114 - Nitrous acid reduces manganese dioxide to manganous oxide, which then dissolves in nitric acid. Its presence may be recognized by the yellow color it imparts to nitric acid, and it may be removed by blowing air through the acid. It is always formed in nitric acid which has been exposed to sunlight, and for that reason this acid should be kept in a dark place. Suck the precipitate dry, and transfer it, with the asbestos filter, to the beaker in which the precipitation was made. Pour into the beaker...
Seite 121 - Gr. when the solution is cold, but in hot solutions the excess of the bismuth tetroxide is rapidly decomposed and then the nitric acid reacts with the permanganic acid and as soon as a small amount of manganous salt is formed the remainder of the permanganic acid is decomposed, manganous nitrate dissolves and manganese dioxide precipitates. In the cold, however, the excess of the bismuth salt may be filtered off and to the clear filtrate an excess of ferrous sulphate added and the amount necessary...
Seite 175 - After incineration the loss in weight gives the carbon. It is advisable to examine the residue under the microscope to ascertain if it is really sand.

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