   Chapter 19, Problem 60GQ

Chapter
Section
Textbook Problem

You want to set up a series of voltaic cells with specific cell potentials. A Zn2+(aq, 1.0 M)| Zn(s) half-cell is in one compartment. Identify several half-cells that you could use so that the cell potential will be close to (a) 1.1 V and (b) 0.50 V. Consider cells in which the zinc cell can be either the cathode or the anode.

(a)

Interpretation Introduction

Interpretation:

The half-cells which can be used to produce a cell potential of 1.1V has to be identified and the cells in which the zinc cell can be either cathode or anode has to be determined.

Concept introduction:

Voltaic cell or Galvanic cell:

The device to produce electricity by using chemical reactions. In these divces are redox chemical reactions are occured.

A voltaic cell converts chemical energy into electrical energy.

It consists of two half cells. Each half cell consists of a metal and a solution of a salt of metal. Two half cells are connected by salt bridge.

The chemical reaction in the half cell is an oxidation reduction (redox)reactions.

For example:

Cell diagram of voltaic or galvanic cell is as follows.

Salt bridge                        Cu(s)|Cu2+(aq)  ||  Ag+(aq)|Ag(s)____________     ___________                                       Half cell             Half cell

Explanation

For 1.1 V

By using copper as cathode to oxidize Zn(s) Zn2+(aq) at the anode.

Let’s write the voltaic cell.

Zn(s)|Zn2+(aq)|| Cu2+(aq)| Cu(s)

Let’s write the half cell reactions.

At anode:Oxidation: Zn(s) Zn2+(aq) + 2e-At cathode:

(b)

Interpretation Introduction

Interpretation:

The half-cells which can be used to produce a cell potential of 0.5V has to be identified and the cells in which the zinc cell can be either cathode or anode has to be determined.

Concept introduction:

Voltaic cell or Galvanic cell:

The device to produce electricity by using chemical reactions. In these divces are redox chemical reactions are occured.

A voltaic cell converts chemical energy into electrical energy.

It consists of two half cells. Each half cell consists of a metal and a solution of a salt of metal. Two half cells are connected by salt bridge.

The chemical reaction in the half cell is an oxidation reduction (redox)reactions.

For example:

Cell diagram of voltaic or galvanic cell is as follows.

Salt bridge                        Cu(s)|Cu2+(aq)  ||  Ag+(aq)|Ag(s)____________     ___________                                       Half cell             Half cell

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