Thermodynamics of hydrochloric acid in propylene carbonate-water mixtures from e.m.f. measurements between 5 and 45 °C

Rabindra N. Roy, William Vernon, James J. Gibbons, Alfred L.M. Bothwell

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7 Scopus citations

Abstract

E.m.f. measurements of cells of the type Pt,H2(g, 1 atm)|HCl(m), PC(X), H2O(100 - X)|AgCl, Ag at five temperatures from 5 to 45°C have been used to derive (i) the standard potentials of the Ag-AgCl electrode, (ii) the mean molal activity coefficient of HCl, (iii) the primary medium effects, and (iv) the thermodynamic constants for the transfer of HCl from water to the respective propylene carbonate-water mixtures. The molality of the acid ranged from 0·005 to 0·2 mol kg-1. The standard e.m.f. varied with temperature (t/°C) according to equations (a)-(c) where X = % (W/W) of propylene carbonate. The results of the thermodynamic functions have been interpreted in terms of the acid-base properties and the breakdown of the solvent structure. (a) Em°(X = 5) = 0·2209 - 5·635 × 10-4(t - 25) - 3·293 × 10-6(t - 25)2 (b) Em°(X = 10) = 0·2188 - 5·843 × 10-4(t - 25) - 5·165 × 10-6(t - 25)2 (c) Em°(X = 20) = 0·2130 - 6·616 × 10-4(t - 25) - 2·725 × 10-7(t - 25)2.

Original languageEnglish (US)
Pages (from-to)3589-3592
Number of pages4
JournalJournal of the Chemical Society A: Inorganic, Physical, and Theoretical Chemistry
DOIs
StatePublished - 1971
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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