Technical Analysis of Steel and Steel Works Materials

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Page 437 - Alternatively, place the beaker in which the precipitation was made under the funnel, pierce the apex of the filter with a stirring rod, and wash the precipitate into the beaker with hot water. Pour warm H2SO4 ( 1 +4) through the paper and wash a few times.
Page 339 - It is kept on a hot-water bath or on an asbestos plate hot (but not boiling) for one-half to one hour. The precipitate is now collected on a Schleicher and Schiill filter, the weight of the ash of which is known (No. 589). Care should be taken never to allow the filter to run dry, and small amounts...
Page 267 - Transfer the granulated tin alloy to a 600-ml beaker and treat with approximately 150 ml of concentrated hydrochloric acid. Cover the beaker with a watch glass and heat until the alloy has been decomposed and vigorous evolution of bubbles from the black insoluble residue has ceased.
Page 433 - They should be washed, in the first instance, with a little water, to which a few drops of acetic acid have been added. When...
Page 361 - ... now be amber-colored. Add 80 cc. of molybdate solution, heat to 80 C., and stir for five minutes. Let the solution stand one hour. Filter and wash well with acid ammonium sulphate solution. Dissolve the precipitate in the least possible quantity of dilute ammonia (1-5) and allow the solution to run into the beaker in which the precipitation was made. Wash the paper well with cold water. The filtrate should be clear and colorless. (If cloudy add hydrochloric acid until the liquid is acid, this...
Page 209 - One hundred cc of it are filtered into beaker, 2 cc concentrated hydrochloric acid are added, heated to boiling, and 10 cc of a 10 per cent. solution of barium chloride added, whereupon the precipitated barium sulphate is treated in the usual manner.
Page 291 - Hold near the boiling point for 15 minutes, let settle and filter on an 1 1 cm. ashless filter paper, using paper pulp. The last portion of the precipitate and reagent is removed from the sides of the beaker with difficulty. Wash the precipitate 5 times alternately with hot dilute hydrochloric acid (1 :1) and hot water and finally 5 times with hot water. If accuracy is not a requirement in the work, ignite in a weighed silica or porcelain crucible at a low temperature until the paper is gone, then...
Page 207 - Transfer 5 g. of drillings to a 12.5-cm. filter paper, and wrap the sample securely in the paper so that at least three thicknesses of paper cover the steel. Place the package in a 25-cc. porcelain crucible, cover the crucible tightly so that no air can enter, and heat for 20 minutes at a bright red heat over a burner or preferably in a muffle. The filter paper should be charred but not burned. Cool and proceed as in the regular method.
Page 225 - Cool in a desiccator and weigh. The increase in weight of the crucible is magnesium pyrophosphate, Mg;P207.
Page 496 - ... times its weight of a mixture of equal parts of sodium carbonate and potassium carbonate until the whole mass is in quiet fusion.

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