(a)
Interpretation: For the given spontaneous
Concept Introduction: In a voltaic cell, oxidation takes place at the anode and reduction takes place at the cathode.
(a)
Explanation of Solution
The given spontaneous redox reaction is as follows:
According to the above reaction, the reduction of
Since oxidation takes place at the anode and reduction occurs at the cathode; thus, at the anode, Fe is converted to
(b)
Interpretation: For the given spontaneous redox reaction of a voltaic cell, charges to the electrodes need to be assigned.
Concept Introduction: In a voltaic cell, oxidation takes place at the anode and reduction takes place at the cathode.
(b)
Explanation of Solution
The charge on the electrode depends on the type of reaction taking place. Here, oxidation occurs at the anode thus, it will have negative potential with respect to the solution and reduction occurs at the cathode; thus, it will have positive potential with respect to the solution.
(c)
Interpretation: For the given spontaneous redox reaction of a voltaic cell, half reactions need to be written.
Concept Introduction: In oxidation, the oxidation state of metal increases, and loss of electron/s takes place. In reduction, the oxidation state of metal decreases, and the gain of electron/s takes place.
(c)
Explanation of Solution
The spontaneous redox reaction is as follows:
Here, reduction of
Anode-Oxidation reaction:
Cathode-Reduction reaction:
(d)
Interpretation: For the given spontaneous redox reaction of a voltaic cell, the standard cell potential at standard conditions for half-cells needs to be calculated.
Concept Introduction: The standard electrode potential of the cell is calculated from the standard electrode potential of the cathode and anode as follows:
(d)
Explanation of Solution
For the given voltaic cell, two half-reactions and their respective reduction electrode potentials are as follows:
Anode:
Cathode:
The standard electrode potential can be calculated as follows:
Substitute the values,
Thus, the standard electrode potential of a given voltaic cell is 0.18 V.
Chapter 21 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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