Laboratory manual of elementary colloid chemistry by Emil Hatschek

Laboratory manual of elementary colloid chemistry

byEmil Hatschek

Paperback | July 4, 2012

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...fine that 50 c.c. of oil of low viscosity, like the paraffins used in lamps, takes 25 to 30 minutes to empty. If the flow is found too rapid it may be reduced by fitting a short length of rubber tubing, provided with a screw clip, to the upper end of the pipette. The apparatus is used as follows: The stopper is removed and a known volume of soap solution poured into the cylinder; it should not exceed one-third of the total PREPARING EMULSIONS. 67 volume. A few drops of the oil to be emulsified are then poured down the funnel and the latter rotated slowly, so that the whole of the tube is wetted by oil. The stopper is then replaced, the pipette filled with oil suspended as explained above, and the ball tube connected to the filter pump. The latter should be so adjusted that the air issues in a uniform string of separate bubbles at the bottom of the funnel tube. When the pump is working properly, the clip at the top of the pipette is opened to the required extent, and the apparatus then requires no further attention. The oil, which runs down the tube in a very thin film, is broken up by the air bubbles when passing out at the lower edge of the tube, and thorough emulsification takes place. Frothing is rather marked at the beginning, but subsides after a little oil has been emulsified, and the ball tube prevents froth from being drawn into the suction tube to any extent. The emulsions made with soap solution separate a "cream," like those prepared with caustic soda, and the same methods may be used for determining the volume ratio. Emulsions which do not separate, whatever the volume ratio, can be made from oils which have the same density as the dispersion medium. The simplest way is to prepare suitable mixtures of either olive oil,...

Details & Specs

Title:Laboratory manual of elementary colloid chemistryFormat:PaperbackDimensions:34 pages, 9.69 × 7.44 × 0.07 inPublished:July 4, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217009573

ISBN - 13:9780217009577

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