Our large Hoffman apparatus is a great way to demonstrate electrolysis as part of your chemistry class (Stoichiometry). Separate water into component oxygen and hydrogen gases. Visibly demonstrate the law of conservation of matter. Lessons can lead students into electrochemistry, gas laws and discussions of alternative energy.
For qualitative and quantitative study of the electrolytic decomposition of electrolytes such as water, hydrochloric acid, etc.
The large Hoffman apparatus consists of two vertical 50 mL, gas-collecting, graduated glass burettes with stopcocks at the top and joined by a bridging tube to a reservoir and fitted with a pair of platinum electrodes at the bottom ends. A lead wire connecting the platinum electrode passes through the glass tube for external connections, so that only the platinum electrode comes in contact with the electrolyte.
This whole apparatus comes packaged in a styrofoam case.
A 6 V battery or low-voltage D.C. power supply is required (not supplied) for operation of this electrolysis apparatus.