Ch.19 - Electrochemistry

McMurry8th EditionChemistryISBN: 9781292336145Not the one you use?Change textbook

McMurry 8th Edition

Ch.19 - Electrochemistry

Problem 79b

Chapter 19, Problem 79b

The following cell reactions occur spontaneously: (b) Which of these substances (A,A+,B,B+,C,C+) is the strongest oxidizing agent? Which is the strongest reducing agent?

Verified step by step guidance

Step 1: Understand the terms 'oxidizing agent' and 'reducing agent'. An oxidizing agent is a substance that gains electrons and is reduced in a chemical reaction, while a reducing agent is a substance that loses electrons and is oxidized.

Step 2: Identify the half-reactions for each of the given substances (A, A+, B, B+, C, C+). Determine which species are being reduced and which are being oxidized.

Step 3: Use the standard reduction potential table to find the reduction potentials for each half-reaction. The substance with the highest reduction potential is the strongest oxidizing agent.

Step 4: Conversely, the substance with the lowest reduction potential (or highest oxidation potential) is the strongest reducing agent.

Step 5: Compare the reduction potentials of the given substances to determine which is the strongest oxidizing agent and which is the strongest reducing agent.

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Key Concepts

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

Oxidizing and Reducing Agents

An oxidizing agent is a substance that gains electrons in a chemical reaction, causing another substance to be oxidized. Conversely, a reducing agent loses electrons, leading to the reduction of another substance. The strength of these agents is determined by their ability to accept or donate electrons, respectively.

Electrode Potentials

Electrode potentials, measured in volts, indicate the tendency of a species to be reduced. A higher (more positive) electrode potential signifies a stronger oxidizing agent, while a lower (more negative) potential indicates a stronger reducing agent. These values are essential for predicting the direction of redox reactions.

Spontaneity of Reactions

A spontaneous reaction occurs without external intervention, often driven by changes in energy or entropy. In redox reactions, spontaneity can be assessed using the Gibbs free energy change, which is related to the electrode potentials of the oxidizing and reducing agents involved.

Related Practice

Textbook Question

The following cell reactions occur spontaneously: (a) Arrange the following reduction half-reactions in order of decreasing tendency to occur:

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Textbook Question

What reaction can occur, if any, when the following experiments are carried out under standard-state conditions? (a) Oxygen gas is bubbled through an acidic solution of Cr(NO3)3.

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Textbook Question

Use the data in Appendix D to predict whether the following reactions can occur under standard-state conditions. (d) Reduction of I₂(s) by H₂SO₃(aq)

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Textbook Question

The following cell reactions occur spontaneously: (c) Which of the three cell reactions delivers the highest voltage?

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Textbook Question

Consider the following substances: Fe(s), PbO2(s), H+(aq), Al(s), Ag(s), Cr2O72-(aq).(d) Which substances can be oxidized by Cu2+(aq)? Which can be reduced by H2O2(aq)?

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Textbook Question

Use the data in Appendix D to predict whether the following reactions can occur under standard-state conditions. (b) Reduction of Ni²⁺(aq) by Sn²⁺(aq)

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