Abstract
The impedance of a dropping mercury electrode in approximately one molar (saturated) sodium fluoride solutions of different pH and saturated with oxygen has been measured at 1000 Hz over an appropriate potential range with respect to Hg/Hg2SO4 electrode as reference. A well-defined pseudocapacitance induced by the first reduction step of oxygen could be traced, which indicated qualitatively faster reduction with rise in pH. By analysis of the results following the simple equivalent of the faradaic admittance, the apparent standard rate constant, ks, was found to be 1·4, 1·6, 1·9, 3·5, 5·3 and 47·4 × 10−2 cm/s in pH 8·80, 10·20, 10·71, 11·42, 12·17 and 12·58 respectively. The dependence of ks on pH is briefly discussed in the light of the electrocapillary behaviour of the hydroxyl ion.
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