   Chapter 18, Problem 85E

Chapter
Section
Textbook Problem

# Under standard conditions, what reaction occurs, if any, when each of the following operations is performed?a. Crystals of I2 are added to a solution of NaCl.b. Cl2 gas is bubbled into a solution of NaI.c. A silver wire is placed in a solution of CuCl2d. An acidic solution of FeSO4 is exposed to air.For the reactions that occur, write a balanced equation and calculate ,ΔG°, and K at 25°C.

(a)

Interpretation Introduction

Interpretation:

Various questions based on the displacement of one ion from its solution by other are to be answered and the E° , ΔG° and K for the possible reaction are to be calculated.

Concept introduction:

The relationship between reduction potential and standard reduction potential value and activities of species present in an electrochemical cell at a given temperature is given by the Nernst equation.

The value of Ecell is calculated using Nernst formula,

E=E°(RTnF)ln(Q)

At room temperature the above equation is specifies as,

E=E°(0.0591n)log(Q)

The relationship between cell potential and Gibbs free energy change is given by the formula,

ΔG°=nFE°cell

To determine: The reaction, if any, when crystals of I2 are added to solution of NaCl .

Explanation

The reduction potential value for I2 is,

I2+2e2IE°=0.52V

The reduction potential value for Cl

(b)

Interpretation Introduction

Interpretation:

Various questions based on the displacement of one ion from its solution by other are to be answered and the E° , ΔG° and K for the possible reaction are to be calculated.

Concept introduction:

The relationship between reduction potential and standard reduction potential value and activities of species present in an electrochemical cell at a given temperature is given by the Nernst equation.

The value of Ecell is calculated using Nernst formula,

E=E°(RTnF)ln(Q)

At room temperature the above equation is specifies as,

E=E°(0.0591n)log(Q)

The relationship between cell potential and Gibbs free energy change is given by the formula,

ΔG°=nFE°cell

To determine: The reaction that takes place when Cl2 gas is bubbled into a solution of NaI .

(c)

c. There occurs no reaction when a silver wire is placed in a solution of CuCl2 .

Interpretation Introduction

Interpretation:

Various questions based on the displacement of one ion from its solution by other are to be answered and the E° , ΔG° and K for the possible reaction are to be calculated.

Concept introduction:

The relationship between reduction potential and standard reduction potential value and activities of species present in an electrochemical cell at a given temperature is given by the Nernst equation.

The value of Ecell is calculated using Nernst formula,

E=E°(RTnF)ln(Q)

At room temperature the above equation is specifies as,

E=E°(0.0591n)log(Q)

The relationship between cell potential and Gibbs free energy change is given by the formula,

ΔG°=nFE°cell

To determine: The reaction, if any, when a silver wire is placed into a solution of CuCl2

(d)

Interpretation Introduction

Interpretation:

Various questions based on the displacement of one ion from its solution by other are to be answered and the E° , ΔG° and K for the possible reaction are to be calculated.

Concept introduction:

The relationship between reduction potential and standard reduction potential value and activities of species present in an electrochemical cell at a given temperature is given by the Nernst equation.

The value of Ecell is calculated using Nernst formula,

E=E°(RTnF)ln(Q)

At room temperature the above equation is specifies as,

E=E°(0.0591n)log(Q)

The relationship between cell potential and Gibbs free energy change is given by the formula,

ΔG°=nFE°cell

To determine: The reaction, if any, an acidic solution of FeSO4 is exposed to air.

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