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O coulômetro de sódio: um experimento interessante de eletroquímica

Author(s): Bonapace José Alberto P.

Journal: Química Nova ISSN 0100-4042
Volume: 27; Issue: 4; Start page: 668; Date: 2004;
Original page

Keywords: sodium coulometer | sodium diffusion | diffusion through glass

ABSTRACT
The diffusion of sodium through glass, the basis of a sodium coulometer, was revised and modified for the application to present-day light bulbs. Low pressure inert gas-filled incandescent lamps are useless to attain satisfactory results. The inclusion of a 450 V power supply in series with the electrolysis cell provided sufficient potential to overcome the effect of the inert gas molecules inside the bulb.