Vapour pressure and calorimetric data for the solution of sulfur dioxide in aprotic solvents
- 31 May 1979
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 57 (11) , 1319-1323
- https://doi.org/10.1139/v79-215
Abstract
Vapour–liquid equilibrium data for dilute sulfur dioxide solutions in sixteen solvents were derived from total vapour pressure measurements at 25 °C. The SO2 enthalpies of solution at infinite dilution ΔH0 were determined at 25 °C by direct calorimetry. The solvents used belong to the aprotic class. The ΔH0 values (kcal mol−1) are for the non-polar solvents, isooctane (−3.5), cyclohexane (−3.5), n-heptane (−3.8), benzene (−5.8), and for the polar solvents, 1,2-dichloroethane (−5.5), nitromethane (−6.2), nitrobenzene (−6.3), acetonitrile (−6.7), ethyl acetate (−7.1), sulfolane (−7.3), propylene carbonate (−7.5), trimethyl phosphate (−8.9), tetrahydrofuran (−9.4), dimethylformamide (−10.9), pyridine (−11.6), dimethylsulfoxide (−13.0). Out of three correlation methods which we tested to account for our data in non-polar solvents, the Hildebrand solubility parameter treatment gives the best results. The SO2 enthalpies of solution, ΔH0, in the polar solvents are discussed in terms of solvent basicity. There is a good correlation between the ΔH0 values, which relate to the basicity of the bulk solvent, and the solvent 'donor number' which is a molecular basicity parameter.This publication has 0 references indexed in Scilit: