Chapter 11: 18E (page 397)
How can you construct a galvanic cell from two substances, each having a negative standard reduction potential?
One can construct a galvanic cell with substances havingnegative standard redox potential.
One can choose two substances with negative standard potentials so as to get as positive.
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What if you want to "plate out" copper metal from an aqueous Cu2+ solution? Use Table 18.1 to determine several metals you can place in the solution to plate copper metal from the solution. Defend your choices. Why can Zn not be plated out from an aqueous solution of using the choices in Table 18.1?
Direct methanol fuel cells (DMFCs) have shown somepromise as a viable option for providing โgreenโ energyto small electrical devices. Calculate Eยฐ for the reactionthat takes place in DMFCS:
Use values of from Appendix 4.
Question:Consider the following reduction potentials:
a. When cobalt metal dissolves in 1.0 Mnitric acid,
will be the primary product (assuming
standard conditions)?
b. Is it possible to change the concentration of
to get a different result in part a?
Sketch a galvanic cell, and explain how it works. Look at Figs. 11.1 and 11.2. Explain what is occurring in each container and why the cell in Fig. 11.2 โworksโ but the one in Fig. 11.1 does not.
Using data from Table 11.1, place the following in order of increasing strength as oxidizing agents (all under standard conditions).
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