# ProbSet5 - CEM 834 PROBLEM SET 5 Due at the beginning of...

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CEM 834 PROBLEM SET 5 FALL 2005 Due at the beginning of class on Monday, November 21, 2005. For each problem, show all work clearly and state any assumptions that you make. For any problems in which you utilize a spreadsheet program, please print at least the first page of the spreadsheet and show all formulas as you enter them into the program. 1. The liquid junction potential between two solutions, assuming a linear concentration profile, can be described by the Henderson equation ( 29 ( 29 - - = i,2 i i i,1 i i i,1 i,2 i i i,1 i,2 i i i J c z u c z u ln c c z u c c z z u F RT E where z i is the charge, u i is the mobility, c i,1 is the concentration on the right hand side of the junction, and c i,2 is the concentration on the left side of the junction for ion i. Values for the ion mobilities at infinite dilution can be found in Table 2.3.2 of Electrochemical Methods by A.J. Bard and L.R. Faulkner. a. Calculate the liquid junction potentials for the following sets of aqueous solutions at 25 °C, and discuss the general trends in junction potential that are observed from these calculations. i. LiI (0.0100 M) LiI (0.0200 M) ii. LiI (0.0100 M) LiBr (0.0200 M) iii. LiI (0.0100 M) NaI (0.0200 M) iv. LiI (0.0100 M) NaBr (0.0200 M) b. The tabulated values for ionic mobility in the Bard and Faulkner text are reported

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## This note was uploaded on 07/25/2008 for the course CEM 834 taught by Professor Mcguffin during the Fall '05 term at Michigan State University.

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ProbSet5 - CEM 834 PROBLEM SET 5 Due at the beginning of...

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