Abstract
A POLAROGRAPHIC depolarization effect due to carbon dioxide in aqueous solutions occurring at − 2.2 V. (from the normal calomel electrode) has been described by Van Rysselberghe1 and v. Stackelberg2. This effect is, however, indistinct. When using absolute (99.8 per cent) ethyl alcohol with 0.3 M tetramethyl ammonium chloride in electrolysis with the dropping mercury cathode, a well-defined wave with a maximum at − 2V. (Fig. 1) is formed on the current-voltage curve. The behaviour shows it to be due to the evolution of hydrogen from carbonic acid, the carbon dioxide molecule being regarded as not reducible. Here nitrogen containing 4 vol. per cent of carbon dioxide was bubbled through the solution for 3–4 min. at room temperature. The equilibrium concentration of carbon dioxide dissolved under its pressure in the gaseous phase is attained very quickly (in about 2 min.). The ensuing limiting current is strictly proportional to the partial pressure of carbon dioxide.
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