A Dictionary of Applied Chemistry, Volume 3

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Longmans, Green, and Company, 1922 - Chemistry, Technical
 

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Page 439 - This neutralisation must be done most carefully ; the alkali should be run down the sides of the flask, the contents of which are kept rapidly swirling with occasional agitation or change of motion until the solution is nearly neutralised, as indicated by the slower disappearance of the colour developed locally by the alkali running into the mixture.
Page 127 - AL Day and ET Allen : The Isomorphism and Thermal Properties of the Feldspars, with optical study by JP Iddings, Publication No. 31, Carnegie Institute of Washington, 1905.
Page 439 - Strength, Free from Carbonate. This can be readily made by dissolving pure sodium hydroxide in its own weight of water (preferably water free from carbon dioxide) and allowing to settle until clear, or filtering through an asbestos or paper filter. The clear solution is diluted with water free from carbon dioxide to the strength required.
Page 441 - The result will include acetylisable impurities, if any be present. 2. Determine the total residue at 160 C. 3. Determine the acetin value of the residue at (2) in terms of glycerol. 4. Deduct the result found at (3) from the percentage obtained at (1) and report this corrected figure as glycerol. If volatile acetylisable impurities are present, these are included in this figure.
Page 440 - ... should be taken and purified with 6 cc of the basic acetate. Care must be taken to avoid a marked excess of basic acetate. Measure off 25 cc of the clear filtrate into a glass flask or beaker (previously cleaned with potassium bichromate and sulphuric acid).
Page 437 - In such cases he shall sample with a sectional sampler, then seal the drums, brand them with a number for identification, and keep a record of the brand number. The presence of any visible salt or other suspended matter is to be noted by the sampler, and a report of same made in his certificate, together with the temperature of the glycerine.
Page 439 - The object of cooling is to avoid any sudden rush of vapours from the flask on adding water, and to avoid breaking the flask. Time is saved by adding the water before the contents of the flask solidify, but the contents may be allowed to solidify and the test proceeded with the next day without detriment.
Page 440 - ... allow to stand a few minutes, dilute with distilled water to 100 cc., and then add 0.15 cc. to compensate for the volume of the precipitate, mix thoroughly, filter through an airdry filter into a suitable narrow-mouthed vessel, rejecting the first 10 cc., and return the filtrate if not clear and bright.
Page 191 - Kjeldahl digestion flask; 10 grams of potassium sulphate and 25 cubic centimetres of concentrated sulphuric acid shall be added, and the flask shall be heated until a clear liquid, colourless, or of light straw colour is obtained. The operation may be accelerated by the addition of a small crystal of copper sulphate or a globule of mercury to the liquid in the digestion flask.
Page 440 - ... the titration is completed. Add from a weighing bottle a slight excess of the ferrous ammonium sulphate (C), making spot tests on a porcelain plate with the potassium ferricyanide (F).

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