Thermodynamics of hydrobromic acid in t-butanol + water mixtures from electromotive force measurements

The standard potentials of AgAgBr electrode have been determined in eighteen t-butanol + water mixtures containing up to 90 wt% t-butanol from the emf measurements of the cell Pt, H₂ (g, 1 atm): HBr (m), X% Bu^tOH, Y% H₂O: AgBr, Ag at nine different temperatures from 15 to 55°C at five intervals. The standard molal potential in each solvent has been expressed as a function of temperature. The standard thermodynamic functions for the cell reaction, the primary medium effects of various solvents upon HBr, and the standard thermodynamic quantities for the transfer of one mole of HBr from water to t-butanol + water media have been computed and discussed.