Hoffman voltameter for electrolysis

Numéro d’image : 11696761
Hoffman voltameter for electrolysis
Electrolysis of water. The Hoffman voltameter,an apparatus used to demonstrate electrolysis of water. Three glass tubes are connected by a bridge near their bases. The middle tube is used to fill the apparatus with water and a small amount of electrolyte (e.g. dilute sulphuric acid). Each of the other tubes has a platinum electrode sealed into its base and is stoppered at the top. When a current is applied to the electrodes,hydrogen is liberated at the cathode (left) and oxygen at the anode in the volume ratio of 2:1. If both gases are diatomic (which they are),this shows that water contains twice as many hydrogen atoms as oxygen - H2O. This apparatus was designed by German chemist August von Hoffman in 1866
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