« < 26 of 1M Zn(NO3)2 1M AGNO3 2 Ag* (aq) + Zn(s)→ 2 Ag(s) + Zn²+(aq) Under standard conditions, the galvanic cell shown above has a cell potential of +1.56 V using the reaction given. The salt bridge contains KNO,, which allows K* ions and NO, ions to move in the directions indicated. If KNO, in the salt bridge is replaced with KOH, some Zn(OH), (s) precipitates in the Zn-Zn(NO,), half-cell. Which of the following best explains how the cell potential is affected as Zn(OH), (s) starts to precipitate, and why? The cell potential increases because the concentration of Zn2+(ag) decreases and Q. becomes smaller. Ag" B The cell potential decreases because the concentration of Zn2+(ag) decreases and Q, Za" becomes smaller. The cell potential increases because K* ions replace Zn2+ ions and the reduction of K* is more thermodynamically favored than the reduction of Zn2. D. The cell potential stays the same because Zn(OH), (s) is not part of the redox reaction responsible for the operation of the galvanic cell.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
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(20
« < 26 of 30
1M Zn(NO)2
1M AGNO3
2 Ag* (aq) + Zn(s) → 2 Ag(s) + Zn²+(aq)
Under standard conditions, the galvanic cell shown above has a cell potential of +1.56 V using the reaction given. The salt bridge contains KNO, which allows K* ions and NO, ions to move
in the directions indicated. If KNO3 in the salt bridge is replaced with KOH, some Zn(OH), (s) precipitates in the Zn-Zn(NO,), half-cell. Which of the following best explains how the cell
potential is affected as Zn(OH), (8) starts to precipitate, and why?
The cell potential increases because the concentration of Zn2+ (aq) decreases and Q.
Zn2+
becomes smaller.
(Ag
A
Submit
The cell potential decreases because the concentration of Zn2+(ag) decreases and Q.
Za
becomes smaller.
[Ag
The cell potential increases because K* ions replace Zn?+ ions and the reduction of K* is more thermodynamically favored than the reduction of Zn2+.
The cell potential stays the same because Zn(OH), (8) is not part of the redox reaction responsible for the operation of the galvanic
Us 6 V O 8:03
Transcribed Image Text:(20 « < 26 of 30 1M Zn(NO)2 1M AGNO3 2 Ag* (aq) + Zn(s) → 2 Ag(s) + Zn²+(aq) Under standard conditions, the galvanic cell shown above has a cell potential of +1.56 V using the reaction given. The salt bridge contains KNO, which allows K* ions and NO, ions to move in the directions indicated. If KNO3 in the salt bridge is replaced with KOH, some Zn(OH), (s) precipitates in the Zn-Zn(NO,), half-cell. Which of the following best explains how the cell potential is affected as Zn(OH), (8) starts to precipitate, and why? The cell potential increases because the concentration of Zn2+ (aq) decreases and Q. Zn2+ becomes smaller. (Ag A Submit The cell potential decreases because the concentration of Zn2+(ag) decreases and Q. Za becomes smaller. [Ag The cell potential increases because K* ions replace Zn?+ ions and the reduction of K* is more thermodynamically favored than the reduction of Zn2+. The cell potential stays the same because Zn(OH), (8) is not part of the redox reaction responsible for the operation of the galvanic Us 6 V O 8:03
Voltmeter
Wire
+1.56 V
NO,
K+
Zn
Ag
1 M Zn(NO3)2
1 M AGNO3
2 Ag (aq) + Zn(s)2 Ag(s)+ Zn? (aq)
Transcribed Image Text:Voltmeter Wire +1.56 V NO, K+ Zn Ag 1 M Zn(NO3)2 1 M AGNO3 2 Ag (aq) + Zn(s)2 Ag(s)+ Zn? (aq)
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