Chapter 21: Q21.1P (page 972)
Define oxidation and reduction in terms of electron transfer and change in oxidation number.
The oxidation number of an atom grows as it loses electrons during oxidation, while the oxidation number decreases as it gets electrons during reduction.
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Can one half-reaction in a redox process take place independently of the other? Explain
Why are E half-cell values for the oxidation and reduction of water different from E° half-cell values for the same processes? In an aqueous electrolytic cell, nitrate ions never react at the anode, but nitrite ions do. Explain.
During the redox balancing process, what step is taken to ensure thatloss equalsgain?
Question: To examine the effect of ion removal on cell voltage, a chemist constructs two voltaic cells, each with a standard hydrogen electrode in one compartment. One cell also contains ahalf-cell; the other contains a half-cell.
(a) What is of each cell 298 K at?
(b) Which electrode in each cell is negative?
(c) When solution is added to the electrolyte, solid forms. What happens to the cell voltage?
(d) When sufficient is added to the electrolyte,forms and drops to . Find the cell voltage.
What purpose does the salt bridge serve in a voltaic cell, and how does it accomplish this purpose?
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