Abstract:
Electromotive force measurements of the cell Pt, H2/HBr(z>i), dioxan(A3 H2O(y)/AgBr/Ag
have been made at 15, 25, 35 and 45“C for solvent compositions X = 10, 20, 30, 40, 60 %(w/w) of
dioxan. These have been used to evaluate the standard potentials of the cell, the mean activity
coefficient of HBr (molal scale) and the thermodynamic functions (mole-fraction scale) for the
transfer of HBr from water to the respective dioxan+water media. The AG’ (free energy of transfer
of the acid from water to various solvents) values along with those for hydrochloric acid, are briefly
discussed in relation to ion solvation.