Dropping funnel

Bromine in acetic acid (3.1 mL, 0.06 mmol, in 25 mL) is then added from the dropping funnel drop-wise over a period of about 1 h in order to ensure the temperature remains at about 10-15°C. 

The heavy colourless dibromide (30 gms.) is now mixed with mete-xylene (30 gms,), and added through a funnel drop by drop to a mixture of sodium (15 gms.) in small pieces, and 70 c.c. of m-xylene. The reaction is vigorous, and if a condenser be fitted to the side-tube of the reaction-flask, the resulting hexamethylene distils over between 70° and 100° this may be refractionated over sodium and that part 

Sulphuric acid is used in making many other acids. As an example, nitric acid— tremendously important in manufacturing explosives and cellulose films—may be made in your home laboratory, but use a glass retort as nitric acid reacts on cork and rubber. Through a paper funnel, drop 25 grams of sodium nitrate into the retort. Carefully pour 20 cc. of concentrated sul- 

Care must be taken to ensure that the liquid from the funnel drops directly into the reaction and not onto the walls of the flask where it will solidify. 

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