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LEC 09 CHAP 13 - Lecture 9 Interionic Interactions Debye...

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TOUPADAKIS Slide 1 of 46 Lecture 9 Interionic Interactions: Debye and Hückel. Colloidal Mixtures. Summary. Problems.
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TOUPADAKIS Slide 2 of 46 Interionic Interactions: Debye and Hückel Ions in solution do not behave independently from each other. Each ion is surrounded by other ions of opposite charge. Ion mobility is reduced by the drag of the ionic atmosphere. Stoichiometric concentration is based on the amount of solute dissolved. “Effective" concentration or activity takes into account interionic attractions. An ion pair is made up of one or more cations and one or more anions held together by electrostatic forces.
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TOUPADAKIS Slide 3 of 46 Colloidal Mixtures Particles of 1-1000 nm size. Nanoparticles of various shapes: rods, discs, spheres. Preferential adsorption. Particles can remain suspended indefinitely. Mutual repulsions overcome the force of gravity. Milk is colloidal.
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TOUPADAKIS Slide 4 of 46 Summary ΔT f = - i (K f m) ΔT b = i (K b m) π = i (M R T) ΔP = - i (X
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