Gooch funnel

If such a funnel is not available, an Erlenmeyer flask connected to the reaction flask by a length of thin-walled rubber tubing (Gooch tubing) may be substituted. In this case, the reaction mixture must not be stirred so vigorously that liquid is splashed up into the neck of the flask, which would cause aluminum chloride to cake there and prevent it from falling into the flask. 

The submitters have used both an addition funnel with a worm gear delivery similar to those manufactured by Normag and an Erlenmeyer flask attached to the neck of the reaction vessel with a piece of Gooch rubber tubing. Normag addition funnels are available from Lab Glass, Inc., P. O. Box 610, Vineland, New Jersey 08360. 

Toluenesulfonyl chloride (175 g, 0.918 mol) is added in one portion under an inert atmosphere via Gooch tubing (the checkers used a powder funnel for the addition). The temperature rises to 40°C for 15-20 min, but returns to 5°C where it is maintained for 2 hr. Twenty 1-mL portions of water are next introduced at such a rate that the temperature does not exceed 5°C. The... 

Gooch, Frank Austin (1852—1929). An American chemist, noted for analytical methods, especially as the inventor of "Gooch Crucible . It is a crucible with perforated bottom packed with glass wool or asbestos and placed in a funnel inserted in the stopper of vacuum flask. Can be used for filtering corrosive liquids Ref Hackh s Diet (1944), 386-L... 

Buchner funnel. Wash the precipitate and filter 3 times with a few cc. of a mixture of 15 g. of KC1, 20 cc. of 95% alcohol, and 100 cc. of H2O, using not more than 20 cc. of the wash soln. in all. Tranisfer the asbestos or paper and precipitate to the beaker in which the precipitation was made wash the Gooch crucible or Buchner funnel with hot H2O, using about 50 cc. in all heat to boiling and titrate the hot soln. with 0.1 N NaOH soln., using phenolphthalein indicator. Increase the number of cc. of 0.1 N alkali required by 1.5 cc. to allow for the solubility of the precipitate. 1 cc. of 0.1 N alkali is equivalent, under these conditions, to 0.015 g. of tartaric acid. To obtain the g. of total tartaric acid per 100 cc. of the wine, subtract the quantity of tartaric acid added from this result. 

The apparatus consists of a 500-ml. round-bottomed flask A (Fig. 1) equipped with a single side arm bearing a 250-ml. separatory funnel B and with an inverted sintered-glass filter funnel C. The latter is held in place by a gum-rubber Gooch crucible holder D and is inserted into an... 

Two types of funnels are useful for vacuum filtration, the Hirsch funnel and the Buchner ftmnel. The Hirsch funnel is used for filtering smaller amounts of solid from solution. Hirsch funnels are usually made from polypropylene or porcelain. The polypropylene Hirsch funnel (see Figure 8.5A) is sealed to a 50-mL filter flask by a small section of Gooch tubing. This Hirsch funnel has a built-in adapter that forms a tight seal with some 25-mL filter flasks without the Gooch tubing. A fritted polyethylene... 

---