Two platinum sheets of about l.5 sq.cm are joined with a stout
platinum wire serve as the electrodes. A calibrated tube (gas burette) is connected to
the electrolysis tube by means of a pressure rubber tube and is capable of moving
vertically so as to adjust the pressure of the collected gases to atmospheric pressure
before measuring the volumes of gases. A 0.5 M solution of potassium sulphate is
used as the electrolyte