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 59 - Dissolve 28 grams of ammonium chloride in distilled water, add a little bromine water and a slight excess of ammonia and filter. Add this solution to the solution of magnesium chloride, add enough ammonia to make the solution smell decidedly of ammonia, dilute to about 2 liters...
Seite 90 - ... about 100-cc. capacity, washing with ammoniacal water. With large precipitates more ammonia may be needed, but always the amounts of ammonia and wash water used should be as small as is consistent with perfect solution of the precipitate and thorough washing. When the precipitate is small the filtrate and washings should amount to about 25 cc. Neutralize the solution with strong hydrochloric acid; if the yellow precipitate forms, add ammonia until it redissolves.1 To the cold alkaline liquid...
Seite 217 - ... contamination from sulphur in the gases from source of heat. This may be done by fitting the crucible in a hole in an asbestos board. The heating of the crucible should be gradually done first over a Bunsen burner for a while and then over a blast lamp, until the contents of the crucible are in quiet fusion. Run the fused mass well up on the sides of the crucible and chill by dipping the bottom of the crucible in a vessel of cold water. If loose, remove the mass from the crucible to a beaker...
Seite 105 - To 100 grams of pure sodium hydroxide add an amount of distilled water just insufficient to completely dissolve it. Pour into a tall cylinder, close the cylinder and allow the insoluble matter to settle. Dilute in the proportion of 30 cc. to 2,000 cc.
Seite 121 - SP- g1- 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...
Seite 185 - ... (1.04 sp. gr.), and heat to boiling. The titanic acid is precipitated almost immediately in a flocculent condition and quite free from iron. Boil for a few minutes, allow the titanic acid to settle, filter, wash with hot water containing a little acetic acid, dry, ignite, and weigh as titanic acid, which contains 60 per cent, titanium.

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