A REVERSIBLE SILVER-SILVER CHLORIDE ELECTRODE FOR 95% (VOLUME) METHANOL-WATER SOLUTIONS,
FLORIDA STATE UNIV TALLAHASSEE
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In the course of recent e.m.f. measurements with the cell glass electrodeH, Cl-, other solutes, 95 vol. methanolAgCl-Ag 1 thermal silver-silver chloride electrodes prepared by the method of Anderson were observed to perform rather sluggishly and to require relatively long periods of time for equilibration, especially after exposure to dilute solutions of mixed electrolytes, e.g., sodium chloride-sodium benzoate mixtures. E is defined as the reference e.m.f. of the silver-silver chloride electrode at 25.0, i.e. E E 0.05915 log CHCC1Y2 where E measured e.m.f. in volts, CHCC1 stoichiometric hydrogen chloride concn., y mean ionic activity coefficient. The equation -log y 1.638 mu 121 2.426 mu 12 is employed to obtain activity coefficients. Although values of E differ for individual glass electrodes, E has been found to remain satisfactorily constant 0.2 mv. and reproducible for a given glass electrode at the ionic strengths employed up to ca. 0.025M.