Thermodynamic properties of multicomponent electrolyte solutions in mixed solvents 4. {HCl( mA) + NaCl( mB)} in {(1 − x)H 2O + xCH 2OHCHOHCH 3} at 278.15 to 318.15 K

Abstract

E.m.f. measurements are reported on the cell: Pt| H 2( g, p °)| HCL( m B ) in {(1− x) H 2 O+ xCH 2 OHCHOHCH 3}| AgCl| Ag with p o = 101.325 kPa and x = 0.025, 0.075, and 0.100 at five temperatures from 278.15 to 318.15 K. The standardm e.m.f.s. E o of AgCl(s) + 1 2 H 2(g) = Ag(s) + H + + Cl − were obtained from the e.m.f. E of the cell with m B = 0 for molalities m A from 0.007 to 0.110 mol·kg −1. The activity coefficients γ A of HCl have also been obtained from the e.m.f.s at constant total ionic strength I = ( m A + m B) = 1 mol·kg −1. The experimental results show that HCl obeys Harned's rule and that lgγ A is a linear function of temperature T, and indicate that the relative partial molar enthalpies of HCl obey a rule analogous to Harned's rule.