Double U-tube w.frits+cock, GL25

Function and Applications

The double U-tube is particularly suited for carrying out electrolysis, in which different electrolytes are used for the anode and cathode and no connection between the two is wanted. If the central chamber is used as a voltaic key, the apparatus can be used to make highly precise voltage measurements (potential measurements) for investigation of electrochemical series or deriving Nernst's equation, since the diffusion potentials arising at the glass filter plates between the anode or cathode chambers are approximately equal but of opposite sign, so that they cancel out.

Equipment and technical data

• Material: DURAN®
• Both side chambers are threaded and have GL 25/8 screw caps as well as side nozzles (glass nipple of external diam. = 8 mm)
• At the bottom of each side chamber is a stop cock with a PTFE spindle so that the electrolyte solutions can easily be mixed
• The centre chamber is threaded and has a GL 25 cap
• The three chambers are separated by G-4 glass filter plates (“frits”)