Explanation Explanation Given The given partial chemical equation is as follows, CrO 7 2 − ( a q ) + Fe 2 + ( a q ) → Cr 3 + ( a q ) + Fe 3 + ( a q ) Redox reaction is a reaction in which simultaneous oxidation and reduction reactions occur. Basically redox reaction is a combination of two processes. One is oxidation half and other is reduction half. Oxidation is a process in which loss of electrons takes place. Reduction is a process in which gain of electrons takes place. The above reaction is a redox reaction. Therefore, it can be expressed in two half reactions which is given below, Cr 2 O 7 2 − ( a q ) → Cr 3 + ( a q ) Fe 2 + ( a q ) → Fe 3 + ( a q ) The above two reactions are the simplest representation of the complete redox reaction. Now, to get the balanced and complete reaction, both the half reactions are balanced separately and then added together. In this method the following steps are followed, The atoms other than oxygen and hydrogen are balanced. After that to balance oxygen and hydrogen water molecules are added. After that in acidic condition hydrogen ions are added to balance the hydrogen. After that charges are balanced by the addition of electrons. After the balancing of both the half reactions, both are added together. Now, apply these rules on first half reaction that is reduction half, Cr 2 O 7 2 − ( a q ) → Cr 3 + ( a q ) Add the coefficient 2 on the right side. The equation is represented as, Cr 2 O 7 2 − ( a q ) → 2 Cr 3 + ( a q ) Now, oxygen atoms are balanced by the addition of seven water molecules to the right side. Equation is represented as, Cr 2 O 7 2 − ( a q ) → 2 Cr 3 + ( a q ) + 7 H 2 O ( l ) Now, add fourteen hydrogen ions to the left side to balance the hydrogen atom. The equation is represented as, Cr 2 O 7 2 − ( a q ) + 14 H + → 2 Cr 3 + ( a q ) + 7 H 2 O ( l ) Now, left side has plus twelve charge and right side has six positive charge. Therefore, to balance the charge six electrons are added to the left side. The equation is represented as, Cr 2 O 7 2 − ( a q ) + 14 H + + 6 e − → 2 Cr 3 + ( a q ) + 7 H 2 O ( l ) (1) Now, apply these rules on second half reaction that is oxidation half, Fe 2 + ( a q ) → Fe 3 + ( a q ) Here, only one electron is added to the right side to balance the reaction

Chemistry: The Science in Context (Fifth Edition)

5th Edition

ISBN: 9780393614046

Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster, Stacey Lowery Bretz, Geoffrey Davies

Publisher: W. W. Norton & Company

See similar textbooks

Concept explainers

Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electroly…

Videos

Question

Chapter 18, Problem 18.17QP

Interpretation Introduction

Interpretation: The given partial chemical equation is to be completed and balanced by the use of appropriate half-reactions in the acidic solutions.

Concept introduction: The number of electrons involved in a redox reaction is always equal with the charge, which is transferred during the whole reaction. To balance “n” positive charges, “n” number of electrons is always involved.

The species which accepts electrons is known as, oxidizing agent while the species which donates electrons is known as, reducing agent. In other words the oxidizing agent is itself a reduced species while the reducing agent is itself an oxidized species.

To determine: The complete and balanced partial chemical equation by the use of appropriate half-reactions.

Expert Solution & Answer

Chapter 18 Solutions

Chemistry: The Science in Context (Fifth Edition)

Ch. 18.2 - Prob. 1PE Ch. 18.2 - Prob. 2PE Ch. 18.3 - Prob. 3PE Ch. 18.4 - Prob. 4PE Ch. 18.6 - Prob. 5PE Ch. 18.6 - Prob. 6PE Ch. 18.7 - Prob. 7PE Ch. 18.9 - Prob. 8PE Ch. 18 - Prob. 18.1VP Ch. 18 - Prob. 18.2VP

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Recommended textbooks for you

Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY