March 4, 2009

March 4, 2009 - March 4 2009 Donnan Equilibrium Donnan...

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Unformatted text preview: March 4, 2009 Donnan Equilibrium Donnan Equilibrium • Ksp (KCl) = [K][Cl] • Two saturated solutions adjacent • K+ + Cl- K+ + Cl- • #1 #2 • No motion between solutions • K sp (KCl, 1) = K sp (KCl, 2) • [K + ] 1 [Cl-] 1 = [K + ] 2 [Cl- ] 2 • If 1mM KCl in # 1 [K]=[Cl] = 1 • Then 1mM in #2 [K]=[Cl] = 1 • [1][1] = [1][1] • Now biological cell with a membrane that lets K and Cl pass freely • Expect 1mM KCl 1 = 1mM KCl 2 • But …… • KCl s1 = 0.8mM KCl s2 = 1.2mM • Novel version of common ion effect • “inside” has a protein salt • K + P- • P- does not pass through membrane. • In this case Side 2 has [K + ] =[Cl- ] = 1.2mM • Side 1 has 0.8 Cl- , 1mM P- and 0.8 + 1 mM of K + from 1 (P) + 0.8 (Cl) • (1.8)(0.8) = (1.2)(1.2) = 1.44 Non-equilibrium Donnan • 1mM KCl on each side • Now add 1mM KP to Side 1 (inside) • KCl forced to side 2 x mM moves • Equilibrium • Side 1 Side 2 • K 1+1-x 1+x • Cl 1 – x 1+x • P 1 • (2-x)(1-x) = (1+x)(1+x)...
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This note was uploaded on 02/26/2012 for the course CHEM 108 taught by Professor Dr.brennan during the Spring '09 term at Binghamton.

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March 4, 2009 - March 4 2009 Donnan Equilibrium Donnan...

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