Temperature dependence of activity coefficients and Gibbs energies of transfer of LiBr in acetonitrile, dimethyl sulfoxide, and N,N-dimethylacetamide from EMF measurements

摘要

Electromotive force (EMF) measurements based on the redox reaction LixHg(1) + TlBr(s) reversible arrow LiBr(solv, C-LiBr) + TlxHg(1) are reported for solutions of LiBr at concentrations 0.005 < c(LiBr)/(mol dm(-3)) < 0.1 in acetonitrile (AN), dimethyl sulfoxide (DMSO), and N,N-dimethylacetamide (DMA) in the temperature range 278.15 < T/K < 308.15. Gibbs energies of transfer and activity coefficients are estimated. The association constants of LiBr in AN, DMSO, and DMA from EMF measurements and the enthalpy of transfer AN --> DMSO are compared to those from other methods of determination.