Unformatted text preview: This type of behavior is important in many systems, most notably for amino acids. The following equilibria are important in modeling the extraction efficiency for oxine between water and chloroform BH BH BH + + H + B-+ H + CHCl 3 H 2 O K D K a1 K a2 where K D is 720, and pK a1 and pK a2 are, respectively, 4.81 and 9.81. Derive a relationship between D and K D for this extraction. Assuming one extraction using 50.0 mL of 10.0mM oxine and 50.0 mL of CHCl 3 , calculate the extraction efficiency for oxine at pH levels of 1, 3, 5, 7, 9, 11, and 13. Graph your results (% extracted vs. pH) and identify the optimal pH for this extraction....
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This note was uploaded on 04/02/2012 for the course CHEMISTRY 222 taught by Professor Mcdonald during the Fall '11 term at University of Illinois, Urbana Champaign.
- Fall '11
- Analytical Chemistry