PURPOSE: To show that pure water is not conducting, but a solution of an electrolyte is conducting.
DESCRIPTION: A 110 VAC lead is connected to a series arrangement of a light bulb and two parallel plates. Shorting the plates will light the bulb. Inserting the plates into distilled water does not light the bulb. Inserting the plates into ta p water lights the bulb dimly and inserting the plates into salt water lights the bulb fully. An electrolyte solution allows passage of electric current.
SUGGESTIONS:
EQUIPMENT: Bottles of distilled water, tap water, and salt water, series 110 VAC circuit with light bulb and two plates.
SETUP TIME: None.
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