   Chapter 19, Problem 20PS

Chapter
Section
Textbook Problem

Balance each of the following unbalanced equations; then calculate the standard potential, E°, and decide whether each is product-favored at equilibrium as written. (All reactions are carried out in acid solution.) (a) I2(s) + Br−(aq) → I−(aq) + Br2(ℓ) (b) Fe2+(aq) + Cu2+(aq) → Cu(s) + Fe3+(aq) (c) Fe2+(aq) + Cr2O72−(aq) → Fe3+(aq) + Cr3+(aq) (d) MnO4− (aq) + HNO2(aq) → Mn2+(aq) + NO3−(aq)

a)

Interpretation Introduction

Interpretation:

The Eo value for the following reactions has to be given and has to decide whether it is a product favoured at equilibrium in the direction.

a) I2(s) + Br-(aq) I-(aq) + Br2(l)

Concept introduction:

Electrochemical cells:

Therese are chemical energy is converted into electrical energy.

In all electrochemical cells, oxidation occurs at anode and reduction occurs at cathode.

An anode is indicated by negative sign and cathode is indicated by the positive sign.

Electrons flow in the external circuit from the anode to the cathode.

In the electrochemical cells two half cells are connected with salt bridge. It allows the cations and anions to move between the two half cells.

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.

Explanation

The given reaction is as follows.

I2(s) + Br-(aq) I-(aq) + Br2(l)

Let’s write a balanced reaction:

I2(s) + 2Br-(aq) 2I-(aq) + Br2(l)

b)

Interpretation Introduction

Interpretation:

The Eo value for the following reactions has to be given and has to decide whether it is a product favoured at equilibrium in the direction.

b) Fe2+(aq) + Cu2+(aq) Cu(s) + Fe3+(aq)

Concept introduction:

Electrochemical cells:

Therese are chemical energy is converted into electrical energy.

In all electrochemical cells, oxidation occurs at anode and reduction occurs at cathode.

An anode is indicated by negative sign and cathode is indicated by the positive sign.

Electrons flow in the external circuit from the anode to the cathode.

In the electrochemical cells two half cells are connected with salt bridge. It allows the cations and anions to move between the two half cells.

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.

c)

Interpretation Introduction

Interpretation:

The Eo value for the following reactions has to be given and has to decide whether it is a product favoured at equilibrium in the direction.

c) Fe2+(aq) + Cr2O72-(aq) Fe3+(aq) + Cr3+(aq)

Concept introduction:

Electrochemical cells:

Therese are chemical energy is converted into electrical energy.

In all electrochemical cells, oxidation occurs at anode and reduction occurs at cathode.

An anode is indicated by negative sign and cathode is indicated by the positive sign.

Electrons flow in the external circuit from the anode to the cathode.

In the electrochemical cells two half cells are connected with salt bridge. It allows the cations and anions to move between the two half cells.

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.

d)

Interpretation Introduction

Interpretation:

The Eo value for the following reactions has to be given and has to decide whether it is a product favoured at equilibrium in the direction.

d) MnO4-(aq) + HNO2(aq) Mn2+(aq) + NO3-(aq)

Concept introduction:

Electrochemical cells:

Therese are chemical energy is converted into electrical energy.

In all electrochemical cells, oxidation occurs at anode and reduction occurs at cathode.

An anode is indicated by negative sign and cathode is indicated by the positive sign.

Electrons flow in the external circuit from the anode to the cathode.

In the electrochemical cells two half cells are connected with salt bridge. It allows the cations and anions to move between the two half cells.

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.

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