Lecture24A - Lecture 24 1 Solid-Liquid Solutions,...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture 24 1 Solid-Liquid Solutions, Electrolytes! (25.5-7) Why are electrolyte and non-electrolyte solutions (treated) so different? For neutrals, long-range interactions are proportional to 1/r 6 short distances for perturbations. For ions, long-range interactions are proportional to 1/r long-distance perturbations. Electrolyte solutions will show non-ideal behavior at much lower concentrations. Fig 25.5 2 depends on molality. m 2 Why does CaCl deviate from ideality more rapidly than NaCl? { { 2 solution H O For a general salt Z Z v v Cation Anion C A v C v A +- +- +- + Charge neutrality: v Z v Z + +-- + = Lecture 24 2 2 2 2 For the solute ln v v RT a + +-- = + = + ln typically we use Henry's Law standard states ln RT a RT a + + +--- = + = + ( 29 2 2 We can identify so ln ln ln v v RT a RT v a v a + +-- + +-- = + = + 2 v v v a a a a +- +- = where mean ionic activity, a v v v +- = = + We cant measure activities separately for a single species of ion, the counter ions must always be present. 2 4 2 3 2 examples , NaCl Na SO a a a a a a a a +- +- = = = = We can define activity coefficients in an analogous manner: , Henry's Law molality definitions a m a m + + +--- = = Lecture 24 3 ( 29 ( 29 ( 29 ( 29 2 v v v v v v v v v a a a a m m m m +- +- +- +- +- + +-- +- +- = = = = ( 29 ( 29 but , v v v v v v m m m +- +- +- +- 2 so as 0, 1 and v v v a a m m a m = = We have a consistent set of definitions.We have a consistent set of definitions....
View Full Document

This note was uploaded on 04/08/2010 for the course CHEM 444 taught by Professor Jameslis during the Spring '08 term at University of Illinois at Urbana–Champaign.

Page1 / 11

Lecture24A - Lecture 24 1 Solid-Liquid Solutions,...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online