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Ch.4 - Reactions in Aqueous Solution
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.4 - Reactions in Aqueous SolutionProblema 51b
Capitolo 4, Problema 51b

Which element is oxidized, and which is reduced in the following reactions? (b) 3 Fe(NO3)2(aq) + 2 Al(s) → 3 Fe(s) + 2 Al(NO3)3(aq)

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Identify the oxidation states of each element in the reactants and products. For the reactants: In Fe(NO3)2, iron (Fe) typically has an oxidation state of +2 and each nitrate (NO3) group has an oxidation state of -1. Aluminum (Al) is in its elemental form, so its oxidation state is 0. For the products: In Fe, iron is in its elemental form, so its oxidation state is 0. In Al(NO3)3, aluminum has an oxidation state of +3 and each nitrate group still has an oxidation state of -1.
Compare the oxidation states of each element in the reactants and products to determine the changes. Iron (Fe) changes from +2 in Fe(NO3)2 to 0 in Fe, indicating a decrease in oxidation state, which is a gain of electrons (reduction). Aluminum (Al) changes from 0 in its elemental form to +3 in Al(NO3)3, indicating an increase in oxidation state, which is a loss of electrons (oxidation).
Conclude which element is oxidized and which is reduced based on the changes in oxidation states. Aluminum (Al) is oxidized as it loses electrons (increase in oxidation state from 0 to +3). Iron (Fe) is reduced as it gains electrons (decrease in oxidation state from +2 to 0).
Write the half-reactions for each process to further illustrate the changes. Oxidation half-reaction: Al(s) → Al^3+(aq) + 3e^-. Reduction half-reaction: Fe^2+(aq) + 2e^- → Fe(s).
Combine the half-reactions to check if the overall electron transfer is balanced, ensuring the number of electrons lost in oxidation equals the number of electrons gained in reduction.

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Oxidation and Reduction

Oxidation and reduction are chemical processes that involve the transfer of electrons between substances. Oxidation refers to the loss of electrons, resulting in an increase in oxidation state, while reduction involves the gain of electrons, leading to a decrease in oxidation state. These processes always occur simultaneously in a redox reaction.
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Oxidation and Reduction Reactions

Oxidation States

Oxidation states (or oxidation numbers) are assigned to atoms in a compound to indicate their degree of oxidation or reduction. They help in identifying which elements are oxidized and reduced in a reaction. For example, in the reaction provided, determining the oxidation states of iron (Fe) and aluminum (Al) will clarify which element undergoes oxidation and which undergoes reduction.
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Oxidation Numbers

Half-Reactions

Half-reactions are a way to separate the oxidation and reduction processes in a redox reaction. Each half-reaction shows either the loss of electrons (oxidation) or the gain of electrons (reduction) for a specific species. By writing the half-reactions for the given reaction, one can easily identify the oxidized and reduced elements, facilitating a clearer understanding of the overall reaction.
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First-Order Half-Life
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