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Standard potentials of silver-silver bromide electrode and related thermodynamic quantities in (5, 10 and 15 wt-%) 2-butanol-water mixtures

The standard potentials of silver-silver bromide electrode in 5, 10 and 15 wt.-% 2-butanol have been determined from e.m.f. measurements of a cell of the type: Pt(or Pd), H_2(g) / HBr(m), 2- butanol-water mixtures / AgBr, Ag at temperatures 15, 25 and 35^oC and in the molality range of HBr from 0.003 to 0.1 mol kg^-1. Standard potentials were utilized to calculate: (1) the standard thermodynamic quantities for the cell reaction and for the reaction of HBr formation, (2) the mean activity coefficients of HBr, and (3) the standard thermodynamic quantities for transfer of HBr from water to 2-butanol-water mixtures. The thermodynamic functions for the transfer process have been interpreted in regard to the acid-base properties and structure of the solvent.

hydrobromic acid ; 2-butanol-water mixtures ; potentiometry ; thermodynamic quantities

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