Thermodynamics of hydrochloric acid in water + 50 mass per cent of ethylene carbonate from e.m.f. measurements at 293.15 to 328.15 K

Abstract

Electromotive force measurements of cells of the type: Pt|H 2(g)HCl(m) in H 2 + ethylene carbonate|AgCl|Ag at 8 temperatures from 293.15 to 328.15 K have been used to derive (a) the standard e.m.f. of the cell in water + 50 mass per cent ethylene carbonate, (b) the activity coefficient of hydrochloric acid, (c) the relative partial molar enthalpy and relative partial molar heat capacity of HCl at 298.15 K, and (d) the thermodynamic quantities for the transfer of HCl from the standard state in water to the standard state in water + 50 mass per cent ethylene carbonate. The molality m of the acid ranged from 0.0098 to 0.25 mol kg −1. The standard e.m.f. was determined by an extrapolation method making use of the extended terms of the Debye-Hückel theory.