   Chapter 21, Problem 80PS

Chapter
Section
Textbook Problem

To prepare chlorine from chloride ion a strong oxidizing agent is required. The dichromate ion, Cr2O72−, is one example (Figure 21.35) Consult the table of standard reduction potentials (Appendix M), and identify several other oxidizing agents that may be suitable. Write balanced equations for the reactions of these substances with chloride ion.

Interpretation Introduction

Interpretation: A balanced chemical equation for a chloride ion with suitable oxidizing agents is to be stated.

Concept introduction:

An oxidizing agent gains electrons and is reduced in a chemical reaction whereas a reducing agent loses electrons and is oxidized in a chemical reaction.

In any electrochemical reaction, electrons goes from one substance to another substance driven by the oxidation-reduction reaction. Electrochemical cells have two conducting electrodes, called the anode and cathode. The anode is defined as the electrode where oxidation occurs. The cathode is the electrode where reduction take place. Standard electrode potential (Ecell) can be calculated for both oxidation and reduction reactions. A positive value of ECell indicates that the reaction proceeds spontaneously in the forward direction whereas, a negative value of Ecell indicates that the reaction proceeds spontaneously in backward direction. The standard cell potential expression is written as follows,

Ecell=Ecathode+Eanode

Explanation

Refer to the appendix M

The Eanode value for the oxidation of Cl ion is 1.36V.

The reaction of oxidation of Cl ion into Cl2 is written as,

2Cl(aq)Cl2(g)+2e

For the preparation of Cl2 from Cl ion, an oxidizing agent is required. A suitable oxidizing agent for the preparation of Cl2 from Cl ion is one who’s standard reduction potential (Eocathode) value is greater than the value of standard oxidation potential (Eoanode) for the chloride ion. In the table 21 given in the appendix M, the oxidizing agents above the half-cell reaction of chloride ion are all suitable oxidizing agents for the preparation of chlorine from the chloride ion

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Find more solutions based on key concepts 