Half-Reactions: Find Strongest Oxidizing Agent

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Discussion Overview

The discussion revolves around identifying the strongest oxidizing agent based on provided half-reactions. Participants analyze the implications of reduction and oxidation forms in the context of a homework problem.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant questions the identification of Cd2+ as the strongest oxidizing agent, suggesting that F- should be considered instead.
  • Another participant challenges the notion of F- being an oxidizing agent, emphasizing that it is a reducing agent.
  • A participant points out that the half-reaction for F- must be flipped to compare it correctly with other agents, indicating a misunderstanding of how to interpret the half-reaction potentials.
  • There is a contention regarding whether the strongest oxidizing agent should be determined from the reduction or oxidation forms of the half-reactions.
  • One participant asserts that the question is about selecting a single species rather than a half-reaction, which adds to the confusion regarding the interpretation of the problem.

Areas of Agreement / Disagreement

Participants express disagreement on the identification of the strongest oxidizing agent, with multiple competing views on the roles of F- and Cd2+ in the context of the half-reactions provided.

Contextual Notes

There are unresolved assumptions about the interpretation of half-reactions and the definitions of oxidizing and reducing agents, which may affect the conclusions drawn by participants.

brake4country
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Homework Statement


Based only on the half-reactions in the table, which of the following is the strongest oxidizing agent?
(See attachment)

Homework Equations

The Attempt at a Solution


I noticed in this table that not all elements are in the reduction form. I flipped them around and changed the sign, however, the correct answer states that Cd2+ is the correct answer. Shouldn't it be F-? Thanks in advance.
 

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brake4country said:
F-?
... an oxidizing agent?
 
Bystander said:
... an oxidizing agent?
Ok, I typed that wrong. According to the chart, we know that the the half reaction: 2F-→F2 + 2e- has potential of -2.87 V. But this is being oxidized. Don't we have to flip it and change it to the reduction half reaction to compare it to the rest of the agents listed?
 
No. F/F2 is an oxidizing agent; F- is a reducing agent.
 
Right, so wouldn't so wouldn't 2F-→F2+ 2e- be the strongest oxidizing agent and not Cd2++2e-→Cd? I think the book is wrong in this one.
 
NO. The half reactions are written with both species; you are not being asked to pick a half reaction, just a single species.
 

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