Physics
Scientific paper
Nov 1953
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953natur.172..861v&link_type=abstract
Nature, Volume 172, Issue 4384, pp. 861-862 (1953).
Physics
Scientific paper
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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