A strong electrolyte contains a large number of ions and will cause the lamp to glow brightly. A weak electrolyte produces fewer ions and will cause the lamp to glow dimly. Strong electrolytes are thought to dissociate completely into ions. These substances are only partially dissociated into ions when dissolved in water. Non-electrolytes do not dissociate much at all.
Ethanol is a non-electrolyte, for example.
To sustain a direct current, some electrode process of oxidation or reduction must occur. An alternating current reduces or avoids this problem. The 9-volt battery makes use of a direct current and, although safe and inexpensive, is limited for this reason. Go to Top TG Disposal Store the toluene in a bottle specifically labeled for reuse in this experiment. Select nontoxic substances for testing.