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Thermodynamic Properties of Hydrobromic Acid in 5 wt% 1-Butanol-Water, and 5 wt% 2-Methyl-1-Propanol-Water Mixture from emf Measurements

From the electromotive force measurements of the cell Pt(or Pd), H_2(g) / HBr(m), 5 wt% alcohol-water mixture / AgBr-Ag for different m in the temperature range from 288.15 to 308.15 K, the standard potential of Ag-AgBr electrode has been determined in the mixture where alcohol was 1-butanol and 2-methyl-1-propanol. The standard thermodynamic quantities for cell reaction and for HBr formation, the activity coefficients of HBr, and the standard thermodynamic quantities for the transfer of HBr from water to mixed solvents have been evaluated. The transfer functions were compared with those for water mixtures of other isomeric butanols as well as for the mixture with small proportions of other alcohols.

hydrobromic acid; 1-butanol-water mixture; 2-methyl-1-propanol-water mixture; potentiometry; thermodynamic quantities

projekt 2.03.01.00.21.B