C611ProblemSet22010_004

C611ProblemSet22010_004 - CHEMISTRY C611: ELECTROANALYTICAL...

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Unformatted text preview: CHEMISTRY C611: ELECTROANALYTICAL CHEMISTRY Fall, 2010 Problem Set 2 1. Examine the variation of the potential of the electrocapillary maximum, E ecm charge) as a function of potential for various aqueous solutions of the three substances listed below. , (or the point of zero Suggest an explanation for the unusual variation of the potential of zero charge for aqueous tetramethyl- ammonium iodide, (CH 3 ) 4 reference electrode was placed in contact with the test solution. NI, solutions in contact with mercury. For all measurements the same KI ______________________________________ Concentration, M E ecm , volts 0.01 0.325 0.03 0.350 0.10 0.365 0.30 0.380 1.00 0.415 (CH 3 ) 4 ______________________________________ NI Concentration, M E ecm , volts 0.005 0.337 0.01 0.350 0.02 0.362 0.03 0.358 0.10 0.350 0.20 0.342 (C 3 H 7 ) 4 ______________________________________ NI Concentration, M E ecm , volts 0.01 0.330 0.03 0.313 0.10 0.305 0.20 0.280 0.25 0.258 0.30 0.240 2. Consider the following galvanic cell, which includes a potassium chloride salt bridge: Hg Hg 2 Cl 2 (s), HCl (0.1 M) KCl (C) KCl (0.1 M), Hg 2 Cl 2 (s) Hg (a) Using a temperature of 25 C, calculate the liquid-junction potential at each side of the salt bridge for concentrations (C) of potassium chloride in the salt bridge of 0.1 and 0.2 M, respectively....
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C611ProblemSet22010_004 - CHEMISTRY C611: ELECTROANALYTICAL...

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