The quinone electrode was introduced in the 1920's as a means of measuring solution pH. Consider the following quinone voltaic cell: Pt (s) | 1:1 mole ratio of quinone:hydroquinone in solution of unknown pH || NaCl (ag) (0.5 M) | Hg»Cl2 (s) | Hg (1) | Pt (s) Half-reaction E° (V) quinone (ag) + 2 H* (ag) + 2 e-2 hydroquinone (aq) Hg2Cl2 (s) + 2 e- 2 2 Hg (1) + 2 Cl (aq) 0.700 0.268 a. Write a Nernst equation that describes this voltaic cell then rearrange it into the form Ecell = A + B pH, where A and B are constants. Determine the values of these constants at room temperature. b. What is the expected cell potential if the 1:1 mole ratio of quinone:hydroquinone is dissolved in a solution of pH 4.5? Assume the dissolution of the hydroquinone does not affect the solution pH. O: но HO- quinone hydroquinone

The quinone electrode was introduced in the 1920's as a means of measuring solution pH. Consider the following quinone voltaic cell: Pt (s) | 1:1 mole ratio of quinone:hydroquinone in solution of unknown pH || NaCl (ag) (0.5 M) | Hg»Cl2 (s) | Hg (1) | Pt (s) Half-reaction E° (V) quinone (ag) + 2 H* (ag) + 2 e-2 hydroquinone (aq) Hg2Cl2 (s) + 2 e- 2 2 Hg (1) + 2 Cl (aq) 0.700 0.268 a. Write a Nernst equation that describes this voltaic cell then rearrange it into the form Ecell = A + B pH, where A and B are constants. Determine the values of these constants at room temperature. b. What is the expected cell potential if the 1:1 mole ratio of quinone:hydroquinone is dissolved in a solution of pH 4.5? Assume the dissolution of the hydroquinone does not affect the solution pH. O: но HO- quinone hydroquinone

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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