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Concept explainers
Diagram the following galvanic cell, indicating the directionof flow of electrons in the external circuit and themotion of ions in the salt bridge.
Write a balanced equation for the overall reaction in thiscell.
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Interpretation:
The given galvanic cell needs to be drawn and a balanced equation for the overall reaction in the cell is to be determined.
Concept introduction:
A galvanic cell is also known as a voltaic cell. It is an electrochemical cell where oxidation-reduction reactions take place and result in the generation of an electric current. In a simple galvanic cell, there are two electrodes: cathode and anode. Each of the electrodes is immersed in their respective metal ions solutions. Thus, there are two compartments of the cell. Both compartments of the cell are connected by a salt bridge which helps in the movement of ions between the compartments of the cell.
Answer to Problem 1P
Diagram of galvanic cell:
Balanced overall cell reaction:
Explanation of Solution
The given cell notation is as follows:
In a cell notation, oxidation is written always before reduction. Thus, in the given case,
Here, platinum is an inert electrode that is the source or sink for electrons. It does not play any chemical role in the electrode reaction.
Since oxidation takes place at the anode and reduction at the cathode, the anodic and cathodic reactions (half-reactions) of the cell can be represented as follows:
At the anode, oxidation takes place as follows:
At the cathode, reduction takes place as follows:
From the above two half-reactions, the overall cell reaction can be obtained as follows:
Thus, the balanced overall cell reaction is as follows:
Now, in a typical galvanic cell, the flow of anions (negatively charged ions) takes place from cathode to anode, and the flow of cations (positively charged ions) takes place from anode to cathode through a salt bridge. Also, in the external circuit, the movement of electrons takes place from anode to cathode. The diagram of the given galvanic cell can be represented as follows:
Thus, the diagram of the galvanic cell and the balanced overall cell reaction is as follows:
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Chapter 17 Solutions
PRINCIPLES OF MODERN CHEMISTRY-OWLV2
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