Laboratory Manual of Organic Chemistry (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...Set the flask into a Babofunnel1 or upon a wire gauze, and heat gently during the operation. (?) It is well to wrap a towel around the upper part of the flask (?). If the steam is passed into the solution when cold a " cracking " sound is often heard. This disappears as soon as the liquid becomes hot. The steam on the desk can be used as the supply. Since there is always considerable condensation water, a 500 cc. flask D/agram of stfpparafus for-Steam Disti/Zafion Fig. 13. should be placed as a trap between the steam nozzle and the.apparatus. Use a three-holed stopper in this flask. The inlet and outlet tubes should be cut off just below the stopper. Into the third hole pass a glass tube leading to the bottom of the flask, bent downwards above the stopper and connected with a piece of rubber tubing to act as a siphon. Use a screw clamp to shut off the siphon. When the flask is nearly filled with water open the clamp and the water-ill go out and it is not necessary to stop the distillation during L is time. If the screw clamp 1 A Babo-funnel is an iron funnel partially lined with strips of asbestos, and is often used in place of an iron gauze. is partly opened and properly adjusted the water will pass out regularly without requiring further attention. Or steam can be generated in an ordinary tin oil-can, provided with a safety tube 50 cm. long; the spout is used for the outlet. Or a flask may be used with a safety tube and outlet tube. The safety tube should extend almost to the bottom, and if a wide one is used, such as a condenser tube, it will also serve for pouring in the water, especially when the "boiler" is hot (although in such a case the "boiler " must not be connected with any apparatus when the...