ANALYSIS OF THE DIFFERENTIAL CAPACITY OF THE MERCURY SIMPLE ALCOHOL SOLUTION INTERFACE

A method of analysing the differential capacity developed by Amokrane and Badiali is applied to investigations of the structure of the inter face between mercury and simple aliphatic alcohols. Capacitance data f or methanol, ethanol, n-propanol and n-butanol are discussed. The solv ent contribution C(S) is obtained by subtracting the contribution C(M) due to the metal from the inner layer capacitance C(i) according to t he procedure proposed by Amokrane and Badiali. The C(S) values are fou nd to be very similar for all aliphatic alcohols studied. The C(S)-sig ma(M) curves have a similar shape with a single maximum at a posititiv e charge density and a characteristic inflection at a negative charge density. The effect of ions in the various supporting electrolytes on the C(S)-sigma(M) profiles was also studied.