1. On receiving his electrical conductivity and their thermodynamic activity coefficients . 2. In these solutions the activity coefficient may actually increase with ionic strength. 3. They can be expressed as functions of derivatives of the activity coefficients . 4. Can a relation between ion transport number and activity coefficient be established? 5. Otherwise conditions must be adjusted so that activity coefficients do not vary much. 6. UNIFAC attempts to be a general model for the successful prediction of activity coefficients . 7. The model can not describe extrema in the activity coefficient along the concentration range. 8. Deviations from ideality can be described by the use of Margules functions or activity coefficients . 9. The relationship between \ gamma and the special activity coefficients , \ gamma _ i is 10. Debye and H�ckel developed a theory with which single ion activity coefficients could be calculated.
