Intro University electrochemistry. 9. A particular cell consists alone half-cell

Question

Intro University electrochemistry.

9. A particular cell consists alone half-cell an which a silver wire coated with AgCl(s) into a 1.0 M Cl^- solution and other half-cell in which a piece of platinum dips into a solution containing 0.10 M CrCl3. 0.0010 M K2Cr2O7, and 1.0 M HCL. In the cell described the following reaction takes place The standard reduction potentials are 1.33 V and 0.2223 V for the couples, respectively. a) Write the half-reactions and the overall cell reaction. b) Determine the standard cell potential and the potential of the cell c) Calculate the equilibrium constant for the reaction

Explanation / Answer

(Ag(s) + Cl- ----> AgCl + 1e-) x6

14H+  + Cr2O7-2 + 6e- -----> 2Cr +3 + 7H2O   

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14H+ + 6Ag(s) + Cr2O7-2 + 6Cl- ---> 6AgCl (s) + 2Cr+3 + 7H2O E = 1.33 - 0.2223 = 1.1077 V

Kc = [0.10] / [0.0010 * 1] = 100

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