<P> A Hofmann voltameter is an apparatus for electrolysing water , invented by August Wilhelm von Hofmann ( 1818 -- 1892 ) in 1866 . It consists of three joined upright cylinders , usually glass . The inner cylinder is open at the top to allow addition of water and an ionic compound to improve conductivity , such as a small amount of sulphuric acid . A platinum electrode is placed inside the bottom of each of the two side cylinders , connected to the positive and negative terminals of a source of electricity . When current is run through Hofmann 's voltameter , gaseous oxygen forms at the anode and gaseous hydrogen at the cathode . Each gas displaces water and collects at the top of the two outer tubes . </P>
<P> A Hofmann voltameter is an apparatus for electrolysing water , invented by August Wilhelm von Hofmann ( 1818 -- 1892 ) in 1866 . It consists of three joined upright cylinders , usually glass . The inner cylinder is open at the top to allow addition of water and an ionic compound to improve conductivity , such as a small amount of sulphuric acid . A platinum electrode is placed inside the bottom of each of the two side cylinders , connected to the positive and negative terminals of a source of electricity . When current is run through Hofmann 's voltameter , gaseous oxygen forms at the anode and gaseous hydrogen at the cathode . Each gas displaces water and collects at the top of the two outer tubes . </P>
name the apparatus used for electrolysis of water
name the apparatus used for electrolysis of water
Hofmann voltameter
Hofmann voltameter