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Ch.20 - Electrochemistry
Tro - Chemistry: A Molecular Approach 5th Edition
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Capitolo 20, Problema 42b

Balance each redox reaction occurring in basic aqueous solution. b. Ag(s) + CN–(aq) + O2(g) → Ag(CN)2–(aq)

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Identify the oxidation and reduction half-reactions. In this case, Ag(s) is oxidized to Ag(CN)_2^-(aq), and O_2(g) is reduced.
Write the oxidation half-reaction: Ag(s) → Ag(CN)_2^-(aq). Balance the silver atoms and add CN^- to balance the cyanide ions.
Write the reduction half-reaction: O_2(g) → OH^-(aq). Balance the oxygen atoms by adding H_2O, and then balance the hydrogen atoms by adding OH^-.
Balance the charge in each half-reaction by adding electrons. The oxidation half-reaction will have electrons on the right, and the reduction half-reaction will have electrons on the left.
Combine the balanced half-reactions, ensuring that the electrons cancel out. Adjust coefficients as necessary to ensure mass and charge balance in the basic solution.

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Redox Reactions

Redox reactions, or reduction-oxidation reactions, involve the transfer of electrons between two species. In these reactions, one species is oxidized (loses electrons) while another is reduced (gains electrons). Understanding the oxidation states of the elements involved is crucial for identifying which species undergo oxidation and reduction.
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Identifying Redox Reactions

Balancing Redox Reactions in Basic Solution

Balancing redox reactions in basic solutions requires a systematic approach that includes separating the reaction into half-reactions for oxidation and reduction. After balancing the atoms and charges in each half-reaction, hydroxide ions (OH-) are added to neutralize any hydrogen ions (H+) that may form, ensuring the reaction adheres to the basic conditions.
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Balancing Basic Redox Reactions

Half-Reaction Method

The half-reaction method is a technique used to balance redox reactions by focusing on the individual oxidation and reduction processes. Each half-reaction is balanced for mass and charge, and then combined to form the overall balanced equation. This method is particularly useful in complex reactions, such as those occurring in aqueous solutions.
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Method 1 of Radioactive Half-Life
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