U-tube

A U-tube is a U-shaped glass tube used in chemical laboratories.

It usually has an attachment below the two openings in the pipe , which is usually used for gas extraction. The larger openings have a size corresponding to the diameter of a commercially available rubber stopper so that they can be closed as required. U-tubes are made of soda-lime glass or borosilicate glass (Duran), which in this case only has the advantage that it gives a special strength. The advantage of the higher heat resistance of Duran glass is not exploited, since a U-tube is usually not heated.

A U-tube can be used:

filled as a salt bridge for the electrolysis of liquids
as a drying tube for gases and solids
for analysis, e.g. B. a gas that reacts with a substance located in the U-tube
for cooling gases

Individual evidence

^ Daniel C. Harris: Textbook of Quantitative Analysis . Edited by Gerhard Werner and Tobias Werner. 8th, completely revised exp. Edition. Springer, Berlin, Heidelberg 2014, ISBN 978-3-642-37788-4 , pp. 327 , urn : nbn: de: 1111-20140219242 .

[1] Daniel C. Harris: Textbook of Quantitative Analysis . Edited by Gerhard Werner and Tobias Werner. 8th, completely revised exp. Edition. Springer, Berlin, Heidelberg 2014, ISBN 978-3-642-37788-4 , pp. 327 , urn : nbn: de: 1111-20140219242 .