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Ch.21 - Transition Elements and Coordination Chemistry
Chapter 21, Problem 59

Will a compound that contains a Fe6+ ion be an oxidizing agent or a reducing agent? Explain.

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Identify the oxidation state of the iron ion in the compound, which is Fe^{6+}.
Recall that an oxidizing agent is a substance that gains electrons in a chemical reaction, causing another substance to be oxidized.
Consider the electron configuration of iron. In its elemental form, iron (Fe) has the electron configuration [Ar] 3d^6 4s^2.
Recognize that Fe^{6+} has lost 6 electrons compared to its neutral state, making it highly electron-deficient and likely to gain electrons.
Conclude that since Fe^{6+} is likely to gain electrons, it acts as an oxidizing agent.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Oxidation and Reduction

Oxidation and reduction are chemical processes that involve the transfer of electrons between species. Oxidation refers to the loss of electrons, while reduction refers to the gain of electrons. In redox reactions, one species is oxidized and another is reduced, which is essential for understanding the behavior of compounds in chemical reactions.
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Oxidizing and Reducing Agents

An oxidizing agent is a substance that facilitates oxidation by accepting electrons from another species, thereby becoming reduced itself. Conversely, a reducing agent donates electrons to another species, causing it to be reduced while the reducing agent is oxidized. Identifying whether a compound acts as an oxidizing or reducing agent is crucial for predicting its chemical behavior.
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Iron Oxidation States

Iron can exist in multiple oxidation states, with Fe6+ being a highly oxidized form. The higher the oxidation state, the stronger the tendency of the ion to act as an oxidizing agent, as it can readily accept electrons to revert to a lower oxidation state. Understanding the oxidation states of iron helps in predicting its reactivity and role in redox reactions.
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