engleski

Thermodynamics of Hydrobromic Acid in 10 wt. Per Cent 2-Propanol-Water Mixture from Electromotive Force Measurements

The e.m.f.’ s of the cell: Pt, H2(g) / HBr(m), 10 wt-% 2-propanol, 90 wt-% water / AgBr, Ag at temperatures 15, 25 and 35 oC for hydrobromic acid solutions in the range from 0.003 to 0.1 mol kg-1 have been measured. The data have been used to derive a) the equation of standard potential of Ag/AgBr electrode as a function of temperature, b) the standard thermodynamic quantities for the cell reaction and the reaction of HBr formation, c) the mean activity coefficients of HBr, d) the primary medium effect, and e) the standard quantities for transfer of HBr from water to the mixed solvent 10 wt-% 2-propanol. According to values for e), it can be stated that the transfer process of HBr is not spontaneous, and that the mixed solvent is a stronger base than water and has a more developed structure than water.

HBr; 2-propanol - water; potentiometry; thermodynamic quantities

nije evidentirano