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Narrative
A conductivity apparatus is placed in a beaker of deionized water and no light is observed. Placed in glacial acetic acid, no conductance is observed. When water is added to the pure acetic acid, the bulb glows brightly demonstrating the importance of water for the ionization of acetic acid.

Discussion
A conductivity apparatus is placed in a beaker of deionized water and no light is observed. When the conductivity apparatus is placed in glacial acetic acid no conductance is observed showing that water and glacial acetic acid are poor conductors of electricity (unionized). However, when water is added to the pure acetic acid, the bulb glows brightly demonstrating the importance of water for the ionization of acetic acid.

CH₃CO₂H(l) + H₂O(l) 1 CH₃CO₂^-(aq) + H₃O⁺(aq)