   Chapter 19, Problem 27PS

Chapter
Section
Textbook Problem

(a) Which halogen is most easily reduced in acidic solution: F2, Cl2, Br., or I2? (b) Identify the halogens that are better oxidizing agents in acidic solution than MnO2(s).

a)

Interpretation Introduction

Interpretation:

To identify which halogen is most eaisly reduced in acidic solution: F2, Cl2, Br2 or I2

Concept introduction:

Standard electrode potential

Under certain conditions a cell potential is measured it is called as standard potential (Ecello).

Standard potential (Ecello) can be calculated by the following formula.

Ecello=Ecathodeo-Eanodeo

The Ecello value is positive, the reaction is predicted to be product favoured at equilibrium.

The Ecello value is negative, the reaction is predicted to be reactant favoured at equilibrium.

Electrochemical series:

It is a decreasing order of the reduction potentials. The most positive E0 are placed in the top in the electrochemical series, it has greater tendency for reduction and lower tendency of oxidation. And the most negative E0 values of elements are placed in the bottom of the series.

Explanation

Write the E0 values of the given halogens.

F2(g) + 2e- 2F-(aq)    ; E0=2.87VCl2(g) + 2e- 2Cl-(aq) ; E0=1.36VBr2(l) + 2e- 2Br-(aq)  ; E0=1

b)

Interpretation Introduction

Interpretation:

To identify the halogens that are better oxidizing agents in acidic solution than MnO2(s)

Concept introduction:

Standard electrode potential

Under certain conditions a cell potential is measured it is called as standard potential (Ecello).

Standard potential (Ecello) can be calculated by the following formula.

Ecello=Ecathodeo-Eanodeo

The Ecello value is positive, the reaction is predicted to be product favoured at equilibrium.

The Ecello value is negative, the reaction is predicted to be reactant favoured at equilibrium.

Electrochemical series:

It is a decreasing order of the reduction potentials. The most positive E0 are placed in the top in the electrochemical series, it has greater tendency for reduction and lower tendency of oxidation. And the most negative E0 values of elements are placed in the bottom of the series.

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