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Chapter 23: Problem 24

You are given these three reducing agents: \(\mathrm{Zn}(\mathrm{s})\) \(\mathrm{Sn}^{2+}(\mathrm{aq}),\) and \(\mathrm{I}^{-}(\mathrm{aq}) .\) Use data from Appendix \(\mathrm{D}\) to determine which of them can, under standard-state conditions in acidic solution, reduce (a) \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}(\mathrm{aq})\) to \(\mathrm{Cr}^{3+}(\mathrm{aq})\) (b) \(\mathrm{Cr}^{3+}(\text { aq })\) to \(\mathrm{Cr}^{2+}(\mathrm{aq})\) (c) \(\mathrm{SO}_{4}^{2-}(\text { aq })\) to \(\mathrm{SO}_{2}(\mathrm{g})\)

Short Answer

Expert verified
The actual agents that may perform the reduction will depend on the E0 values found in Appendix D. If the E0 value of the reducing agent is lower than that of the oxidizing agent, then it can perform the reduction. Without the actual values, no specific agents can be specified.

Step by step solution

01

Identify the E0 values

First, refer to Appendix D to find the standard reduction potentials (E0) for the agents. Remember, a higher E0 value denotes a stronger oxidizing agent, and a lower E0 value (i.e., a more negative or less positive value) indicates a stronger reducing agent.
02

Predict the redox reactions

For Part (a), compare the E0 values of \(\mathrm{Zn}(\mathrm{s})\), \(\mathrm{Sn}^{2+}(\mathrm{aq}),\) and \(\mathrm{I}^{-}(\mathrm{aq})\), with that of \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}(\mathrm{aq})\). The effective reducing agents are the ones whose E0 values are lower. Repeat this step for parts (b) and (c).
03

Conclude

State which of the reducing agents (if any) can reduce the oxidizing agents in each part of the question.

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