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Ch.20 - Electrochemistry
Brown - Chemistry: The Central Science 15th Edition
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Tutti i libri di testoBrown 15th EditionCh.20 - ElectrochemistryProblema 25c
Capitolo 20, Problema 25c

Complete and balance the following half-reactions in basic solution. In each case, indicate whether the half-reaction is an oxidation or a reduction. c. Cr(OH)3(𝑠)⟶CrO42−(𝑎𝑞)

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Identify the oxidation states of chromium in Cr(OH)_3 and CrO_4^{2-}.
Determine whether the half-reaction is an oxidation or a reduction by comparing the oxidation states.
Balance the chromium atoms on both sides of the equation.
Balance the oxygen atoms by adding H_2O molecules to the appropriate side.
Balance the hydrogen atoms by adding OH^- ions to the appropriate side and ensure the charge is balanced.

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Half-Reactions

Half-reactions are equations that show either the oxidation or reduction process occurring in a redox reaction. They represent the transfer of electrons, with oxidation involving the loss of electrons and reduction involving the gain of electrons. In this context, balancing half-reactions is essential to ensure that both mass and charge are conserved.
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01:49
First-Order Half-Life

Oxidation and Reduction

Oxidation is defined as the process where a substance loses electrons, resulting in an increase in oxidation state, while reduction is the gain of electrons, leading to a decrease in oxidation state. Identifying whether a half-reaction is an oxidation or reduction is crucial for understanding the overall redox process and for balancing the reaction correctly.
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01:53
Oxidation and Reduction Reactions

Basic Solution Conditions

In basic solutions, the presence of hydroxide ions (OH⁻) influences the balancing of half-reactions. When balancing in basic conditions, it is often necessary to add OH⁻ ions to neutralize any H⁺ ions that may appear during the balancing process. This ensures that the final balanced equation accurately reflects the conditions of the reaction.
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01:04
Balancing Basic Redox Reactions
Pratica correlata
Domanda del libro di testo

Complete and balance the following equations, and identify the oxidizing and reducing agents: (a) Cr2O72-(aq) + I-(aq) → Cr3+(aq) + IO3-(aq) (acidic solution) (b) MnO4-(aq) + CH3O(1aq) → Mn2+(aq) + HCOOH(aq) (acidic solution) (c) I2(s) + OCl-(aq) → IO3-(aq) + Cl-(aq) (acidic solution)

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Domanda del libro di testo

Complete and balance the following half-reactions in basic solution. In each case, indicate whether the half-reaction is an oxidation or a reduction.


a. OH−(𝑎𝑞)⟶O2(𝑔)

b. SO32−(𝑎𝑞)⟶SO42−(𝑎𝑞)

c. N2(𝑔)⟶NH3(𝑔)

d. HO2−(𝑎𝑞)⟶OH−(𝑎𝑞)

Domanda del libro di testo

Complete and balance the following equations, and identify the oxidizing and reducing agents: MnO4-(aq) + Br-(aq) → MnO2(s) + BrO3-(aq) (basic solution)

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Domanda del libro di testo

Complete and balance the following half-reactions in basic solution. In each case, indicate whether the half-reaction is an oxidation or a reduction.

a. O2(𝑔)⟶H2O(𝑙)

b. Mn2+(𝑎𝑞)⟶MnO2(𝑠)

c. Cr(OH)3(𝑠)⟶CrO42−(𝑎𝑞)

d. N2H4(𝑎𝑞)⟶N2(𝑔)

Domanda del libro di testo

Complete and balance the following half-reactions in acidic solution. In each case indicate whether the half-reaction is an oxidation or a reduction. b. H2SO3(𝑎𝑞)⟶SO42−(𝑎𝑞)

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Domanda del libro di testo

Complete and balance the following half-reactions. In each case, indicate whether the half-reaction is an oxidation or a reduction. (f) SO32-1aq2 ¡ SO42-1aq2 (basic solution)

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