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E lectromotive-force measurements of cells without liquid junction that contained hydrogen and silver-silver-chloride electrodes and alkaline p-phenolsulfonate buffers with added salts of differeJlt valence types were mape from 0° to 60° C. The 63 buffer solutions studied were prepare d by the partial neutralization of potassium p-phenolsulfonate with sodium hydroxide, and each contained approximately equal molal amounts of potassium p-phenolsulfonate and of potassium sodium p-phenolate sulfonate. These solutions were classified into five series on the basis of the kind of added salt and the ratio, R, of its molality to the molality of each buffer salt, a s follows: Potassium nitrate, R = 1 i sodium sulfate, R = li sodium sulfate, R = 0.5i barium chloride, R = 0.5i trisodium citrate, R = 0.33. All the bu'fIers, with the exception of t he series to which barium chloride was added, likewise contained sodium chloride, R= 1. The ionic strengths of the solutions varied from 0.05 to 0.8. The values of the second dissociation constant of p-phenolsulfonic acid given in an earlier paper were confirmed. The influence of potassium nitrate, sodium sulfate, and trisodium citrate on the activity coefficient term, fcIiHP. /fp., in which f represents an activity coefficient on the molal scale and the subscripts represent respectively chloride ion and the primary and secondary anions of the buffer, 'was determined for solutions containing no sodium chloride at 0° to 35° C. No pronounced differences in character were observed among the effects of the salts of the three valence types in concentrations sufficient to make up one-fifth of the ionic strength of the mixture.

Salt effects of potassium nitrate, sodium sulfate, and trisodium citrate on the activity coefficients of p-phenolsulfonate buffers