Correlation of the osmotic coefficients of the solutions of 1:1 salts in methanol by modified local composition models at 298.15Â K

Published osmotic coefficient data for the solutions of some 1:1 electrolytes in methanol along with new experimental data for tetramethylguanidinium perchlorate were correlated using local composition models. The studied models are electrolyte non-random two liquid (e-NRTL), non-random factor (NRF), modified NRTL (MNRTL), mean spherical approximation NRTL (MSA-NRTL) and extended Wilson models. In the e-NRTL, NRF, MNRTL and EW models the MSA term was used as the long-range contribution. Results were compared with Pitzer's ion interaction model. All of the models give reliable results.