
To write:
The balanced equation for the cell for each given pair and identify which half-reaction takes place at the anode and which at the cathode.

Answer to Problem 17.31QA
Solution:
Anode:
Cathode:
------------------------------------------------------------------------------
Balanced equation:
Anode:
Cathode:
------------------------------------------------------------------------------------------------------
Balanced equation:
Anode:
Cathode:
-----------------------------------------------------------------------------------------
Balanced equation:
Explanation of Solution
1) Concept:
We are asked to write and balance the cell reaction from the given pair. Values of standard reduction potential are given in appendix 6, table A6.1. Higher the standard reduction potential, higher is the tendency to reduce. So, the element that has negative or small value of standard reduction potential is more likely to oxidize. Therefore, we reverse that reaction to make it an oxidation half reaction. For an
Adding two half
2) Formula:
3) Given:
i)
ii)
iii)
4) Calculations:
a.
The standard reduction potential values for all these reactions taken from the Appendix 6, table A6.1 are as follows:
Combining the two equations to get the balanced cell reaction:
Anode:
Cathode:
-------------------------------------------------------------------------
Since the standard reduction potential for
b.
Anode:
Cathode:
------------------------------------------------------------------------------------------------------
Since the standard reduction potential for
c.
In this pair of reactions, electrons are not the same, so we need to balance them. Hence, multiply the first reaction by 2, and we get
Anode:
Cathode:
-------------------------------------------------------------------------------------------
Since the standard reduction potential for the second given half reaction is higher than that of
Conclusion:
For an electrochemical cell, reduction occurs at cathode while oxidation occurs at anode.
The element with higher standard reduction potential value will serve as a cathode while the element with a lower standard reduction potential value will serve as an anode.
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Chapter 17 Solutions
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