Abstract
The differential capacitance of mercury in pure aqueous electrolytes and in the presence of quinoline was traced in 1 N solutions of Na 2SO 4, KNO 3, KCl and HCl over wide potential ranges at 1 kHz and 25 °C. The results indicated that quinoline molecules that are adsorbed at the mercury drop electrode reorient at certain potential ranges depending on both the quinoline concentration and the supporting electrolyte. The adsorption of quinoline in the vertical position is somewhat inhibited in a strong acid medium. Calculation of areas occupied by planar and vertical molecules yielded values comparable with previously reported results. Relative coverages at saturation calculated from minimum capacitances were correlated with the molecular areas of planar and vertically oriented molecules. Variation in the relative surface coverage with potential could be easily identified with planar or vertical adsorption.
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