Technical Methods in Analysis of Metallurgical and Allied Products: A Manual of Analytical Methods and Useful Data for the Chemist and the College Student

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D. Van Nostrand Company, 1923 - Metallurgical analysis - 875 pages
 

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Page 724 - The gram calorie, or small calorie (cal.), is the amount of heat required to raise the temperature of 1 gram of water 1...
Page 375 - Agitate the flask to facilitate the precipitation and see that a slight excess of zinc oxide remains when the reaction is complete. Now dilute the contents of the flask up to the mark with cold water, mix thoroughly and allow to stand a short time and partially settle. By means of a graduated pipette draw off 100 cc. of the clear supernatant liquid and transfer it to an 8-oz. flask. While the precipitate in the 500-cc.
Page 145 - The receiving fla.sk has a cork stopper with a hole to accommodate the tube of the condenser and a slit to permit the escape of air from the flask. Gooch recommends cooling of the receiving flask. VOLUMETRIC DETERMINATION OF BORON...
Page 373 - ... special difficulties except that it must be noted that while in hot solutions the chromium is oxidized to chromic acid, which is reduced by the addition of sulphurous acid, the oxidation proceeds so slowly in cold solutions that if there is no delay in the filtration and titration the results are not affected. Steels containing tungsten are sometimes troublesome on account of the necessity for getting rid of the tungstic acid. Those that decompose readily in nitric acid may be filtered and the...
Page 759 - A change of temperature of 1 makes a change of 0.36% of the volume of the gas: a change of pressure of 1 mm. produces 0.13% change in the volume. Manipulation. The reagents in the pipettes should be adjusted in the capillary tubes to a point on the stem about midway between the top of the pipette and the rubber connector. This is effected by opening wide the pinchcock upon the connector, the bottle being on the table, and very gradually lowering the bottle until the reagent is brought to the point...
Page 194 - A solid immersed in a liquid is buoyed up by a force equal to the weight of the liquid displaced.
Page 437 - Ammonium Molybdate. One hundred grams of pure molybdic acid are thoroughly mixed with 400 cc. of cold distilled water and 80 cc. of strong ammonia (sp.gr. 0.90) added. When the solution is complete, it is poured slowly and with constant stirring into a mixture of 400 cc. of strong nitric acid (sp.gr. 1.42) and 600 cc. of distilled water. /This order of procedure should be followed, as the nitric acid poured into the ammonium molybdate solution will cause the precipitation of a difficultly soluble...
Page 332 - Then thoroughly mix in 0.2 gram of sodium nitrate and fuse the mass with the cover removed. Dissolve the contents of the crucible in water, filter and evaporate the filtrate with hydrochloric acid in excess, using a porcelain container; repeat the evaporation with water and hydrochloric acid to insure...
Page 372 - 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.
Page 212 - ... thiocyanate, which color serves as an indication of the completion of the reaction. An excess of silver nitrate is added to the nitric acid solution containing the chloride, AgCl filtered off, and the excess of silver titrated with the thiocyanate in presence of the ferric salt. Copper (up to 70%), arsenic, antimony, cadmium, bismuth, lead, iron, zinc, manganese, cobalt, and nickel, do not interfere, unless the proportion of the latter metals is such as to interfere by intensity of the color...

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