Bunsen funnel

Porcelain disc used with Bunsen funnel to serve as semimicro suction funnel... 

Funnels. The glass Bunsen fuimel which is used with the semimicro technic is 50 mm in diameter with a stem 60 mm long. The Bunsen funnel is easily and economically converted to a Buchner funnel by using a 20 mm porcelain disc as shown in Figure 2(6). The micro Buchner funnel has a diameter of 42 mm at the top, 8.5 mm diameter of perforated area, and stem of about 50 mm in length. The porcelain perforated disc is 20 mfn in diameter, has beveled edges, and fits inside the funnel at a depth of 30 mm from the rim. 

Raise a water bath under the flask and heat at 60-70° for 10-12 hours. Remove cork and arrange for distillation. Use a one-hole cork on the flask and connect by means of a glass tube to a regular micro receiving setup. Distill the mixture of thionyl chloride and benzene until the amount of the distillate collected is about 8 ml. Add 80 ml of dry benzene to the residue in the flask and replace the micro condenser on the mouth of the flask so that the benzene can be refluxed for 10-15 minutes. While the benzene is refluxing place a Bunsen funnel over a 250-ml Erlenmeyer flask with a folded filter paper in the funnel. Put the apparatus in the hood. Pour the hot benzene extract into the folded filter paper. 

The basin A is then gently heated by a small Bunsen flame, which should be carefully protected from side draughts by screens, so that the material in A receives a steady uniform supply of heat. The material vaporises, and the vapour passes up through the holes into the cold funnel C. Here it cools and condenses as fine crystals on the upper surface of the paper B and on the walls of C. When almost the whole of the material in A has vaporised, the heating is stopped and the pure sublimed material collected. In using such an apparatus, it is clearly necessary to adjust the supply of heat so that the crude material in A is being steadily vaporised, while the funnel C does not become more than luke warm. 

B. 3,5-Dinilro-o-tolunitrile. A 500-ml. four-necked flask is equipped with a mechanical stirrer, a dropping funnel, a thermometer, and an inlet for dry nitrogen (Note 13). It is baked thoroughly by means of a Bunsen flame and allowed to cool to room temperature with a slow stream of dry nitrogen passing through it. The flask is charged, preferably in a dry box, with 335 g. of tetramethylene sulfone (Note 14) and 73.1 g. (0.55 mole) of nitronium tetrafluoroborate. The thermometer is adjusted so... 

Bunsen, Robert W. von( 1811-1899). A Ger chemist noted for gasometric and photometric researches and for various inventions, such as burner, valve, cell, clamp funnel eudiometer. The first theory of the burning process of black powder was estabilished by him and simultaneously by a Russian chemist, L. Shishkoff. Bunsen lost the sight of his right eye due to the expln of cacodyl Cyanide, which he discovered together with other derivs of cacodyi... 

Contot-Gockel Valva. A Device which serves to prevent entrance of air from without into a closed flask. It consists of a small separatory funnel contg a soln of Na bicarbonate and provided inside with a thin syphon tube. The stem of the funnel is inserted in the stopper of the flask (Comp with Bunsen Valve described in Vol 2, p B341-R of this Encycl)... 

Mortar pestle 100 ml beaker evaporating dish funnel filter paper tongs three small test tubes Bunsen burner or candle matches pea-size amount 2CuC03 Cu(OH)2 (azurite) other soft minerals such as talc gypsum or calcite 9.2 g C0(N03)2 (cobalt II nitrate) 5.3 g Na2C03 (sodium carbonate) 100.0 ml graduated cylinder distilled water centigram balance four small test tubes small spatula wash bottle two 250 ml beakers. 

A 1-1. three-necked round-bottomed flask is fitted with a Tru-bore paddle stirrer, a long water-cooled reflux condenser, a dropping funnel, and a gas inlet as shown in Fig. 11. The apparatus is dried by flaming with a Bunsen burner while being flushed with a stream of dry nitrogen. 

Thirty grams of pure iron powder (0.54 mol) is placed in the bottom of a three-necked 2-1. flask equipped with (1) a reflux condenser with a stopper and small glass tube or Bunsen valve at the terminal end to allow venting of the hydrogen and to minimize entrance of air into the system (2) a siphon linej with a glass-wool plug as a strainer, filled with wTater and closed with a stopcock or pinch clamp until needed and (3) a separatory funnel. Twelve hundred milliliters of distilled water and 100 ml. of 45 % formic acid are introduced into the flask. The contents are boiled until... 

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