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Solved: Determining pH Using a Concentration CellA voltaic

Chemistry: The Central Science | 13th Edition | ISBN: 9780321910417 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus ISBN: 9780321910417 77

Solution for problem 1PE Chapter 20.13SE

Chemistry: The Central Science | 13th Edition

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Chemistry: The Central Science | 13th Edition | ISBN: 9780321910417 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus

Chemistry: The Central Science | 13th Edition

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Problem 1PE

Determining pH Using a Concentration Cell

A voltaic cell is constructed with two hydrogen electrodes. Electrode 1 has PH2 = 1.00 atm and an unknown concentration of H+(aq). Electrode 2 is a standard hydrogen electrode (PH2 = 1.00 atm, [H+] = 1.00 M). At 298 K the measured cell potential is 0.211 V, and the electrical current is observed to flow from electrode 1 through the external circuit to electrode 2. Calculate [H+] for the solution at electrode 1. What is the pH of the solution?

A concentration cell constructed from two hydrogen electrodes, both with PH2 = 1.00. One electrode is immersed in pure H2O and the other in 6.0 M hydrochloric acid. What is the emf generated by the cell and what is the identity of the electrode that is immersed in hydrochloric acid?

(a) -0.23 V, cathode, (b) 0.46 V, anode, , (c) 0.023 V, anode, , (d) 0.23 V, cathode, , (e) 0.23 V, anode.

Step-by-Step Solution:

Problem 1PEDetermining pH Using a Concentration CellA voltaic cell is constructed with two hydrogen electrodes. Electrode 1 has PH2 = 1.00 atm and +an unknown concentration of H (aq). Electrode 2 is a standard hydrogen electrode (PH2 = 1.00 +atm, [H ] = 1.00 M). At 298 K the measured cell potential is 0.211 V, and the electrical current isobserved to flow from electrode 1 through the external circuit to electrode 2. Calculate [H ] for +the solution at electrode 1. What is the pH of the solutionA concentration cell constructed from two hydrogen electrodes, both with PH2 = 1.00. Oneelectrode is immersed in pure H O and the other in 6.0 M hydrochloric acid. What is the emf 2generated by the cell and what is the identity of the electrode that is immersed in hydrochloricacid(a) -0.23 V, cathode, (b) 0.46 V, anode, , (c) 0.023 V, anode, , (d) 0.23 V, cathode, , (e) 0.23 V,anode. Step-by-step solution Step 1 of 1 Calculate OH concentration from the equilibrium for the dissociation of water is which is givenbelow H O H + OH - 2Water breaks into hydrogen ion and hydroxide ion and the equilibrium constant is given by the + - -14expression K =wH ][OH ] which is equal to 1.00 x 10 where, K iw e equilibrium constant forwater at ambient temperature. -7Hydroxide concentration is 1.00 x 10 pOH is 7 and pH is also 7.From Nernst relation as follows:E = E - 0.0592 log (Q) Since the cell is concentrated with 2 hydrogen electrodes E is cell O ( n ) cellzero and n = 2 because 2 electrons are transferred. Hence, + 2 [H ] calc Q = + 2 [H ] actual\n 2 (1.00×10 )7 Q = 2 6 1.00×10 14 = 36 -16 = 2.78 x 10Ecell - ( 0.0592 ) log (2.78 x 10 ) 2 = - (0.0296)(-15.56) = 0.46 VOne hydrogen electrode is immersed in water and the other is immersed in hydrochloric acid.The identity of the electrode is important. The hydrogen electrode immersed in HCl serves asanode.The answer is 0.46 v, anode.Hence the correct option is (b)

Step 2 of 1

Chapter 20.13SE, Problem 1PE is Solved
Textbook: Chemistry: The Central Science
Edition: 13
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus
ISBN: 9780321910417

The answer to “Determining pH Using a Concentration CellA voltaic cell is constructed with two hydrogen electrodes. Electrode 1 has PH2 = 1.00 atm and an unknown concentration of H+(aq). Electrode 2 is a standard hydrogen electrode (PH2 = 1.00 atm, [H+] = 1.00 M). At 298 K the measured cell potential is 0.211 V, and the electrical current is observed to flow from electrode 1 through the external circuit to electrode 2. Calculate [H+] for the solution at electrode 1. What is the pH of the solution?A concentration cell constructed from two hydrogen electrodes, both with PH2 = 1.00. One electrode is immersed in pure H2O and the other in 6.0 M hydrochloric acid. What is the emf generated by the cell and what is the identity of the electrode that is immersed in hydrochloric acid?(a) -0.23 V, cathode, (b) 0.46 V, anode, , (c) 0.023 V, anode, , (d) 0.23 V, cathode, , (e) 0.23 V, anode.” is broken down into a number of easy to follow steps, and 156 words. Since the solution to 1PE from 20.13SE chapter was answered, more than 766 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Chemistry: The Central Science, edition: 13. The full step-by-step solution to problem: 1PE from chapter: 20.13SE was answered by , our top Chemistry solution expert on 09/04/17, 09:30PM. This full solution covers the following key subjects: . This expansive textbook survival guide covers 305 chapters, and 6352 solutions. Chemistry: The Central Science was written by and is associated to the ISBN: 9780321910417.

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