1CHM3400 - Lecture 14–Feb 9Electrolyte solutions (Chapter 5p. 154-170)•Electrostatic interactions between ions: vacuum and solution (dielectric constant)•Enthalpy, entropy and Gibbs free energy of ions in solution•Ionic activity•Debye-Huckel LawElectrolyte= substance, that when dissolved in solution, makes the solution conduct electricity
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2Hydration shellIon-dipole interactions between ions and the water solutionWhy does NaCl dissolve in water, but not in benzene?Mean life-time of an H2O molecule in the solvation shell:Br-10-11sNa+10-9sFe3+10-5sAl3+7 sCr3+1.5x105sIonic radii of hydrated cations:Li+(3.66 Å), Na+(2.80 Å) and K+(1.87 Å)