Thermodynamic properties of hydrochloric acid in dimethylformamide–water mixtures at different temperatures
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society B: Physical Organic
- p. 2320-2322
- https://doi.org/10.1039/j29710002320
Abstract
The standard potential of the Ag–AgCl electrode has been determined from the e.m.f. of a cell of the type Pt,H2(gas 1 atm)|HCL (m), Me2N·CHO (X), H2O (100 –X)|AgCl, Ag at five different temperatures in the range 5–45 °C. Measurements were made in dimethylformamide–water mixtures [X= 5 and 10%(w/w)] for acid concentrations in the range 0·005–0·2 mol kg–1. The mean activity coefficients of HCl have been calculated. The standard thermodynamic quantities (ΔG°, ΔH°, ΔS°, and ΔCp°) accompanying the transfer of HCl from water to the respective solvent media have been computed from the variations of ΔEN°(the difference in standard e.m.f. between the ordinary water and the mixed solvent on the mole-fraction scale) with temperature. The results have been discussed with respect to the solvent structure and acid–base behaviour on the transfer process.Keywords
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