World of Chemistry, 3rd edition
World of Chemistry, 3rd edition
3rd Edition
ISBN: 9781133109655
Author: Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher: Brooks / Cole / Cengage Learning
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Chapter 18.3, Problem 7RQ
Interpretation Introduction

Interpretation: The changes occur to the battery while recharging needs to be explained.

Concept Introduction: In the electrochemical cell, the reactions at cathode and anode occur due to the difference in their reduction electrode potential value.

The EMF of the cell can be calculated with help of electrode reduction potential values.

Expert Solution & Answer
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Answer to Problem 7RQ

When battery recharge, the reverse reaction occurs which converts lead sulphate to PbO2 and regenerate sulphuric acid.

Explanation of Solution

In a lead storage battery, lead is anode and a grid of lead is cathode with lead dioxide (PbO2). The battery contains 38% of sulphuric acid as an electrolyte solution.

As battery remains in use the concentration of sulphuric acid changes due to given reactions:

  Pb(s) + SO2-4(aq)    PbSO4(s) + 2e-  at anode

A

When battery recharge, the reverse reaction occurs which converts lead sulphate to PbO2 and regenerate sulphuric acid.

Conclusion

When battery recharge, the reverse reaction occurs which converts lead sulphate to PbO2 and regenerate sulphuric acid.

Chapter 18 Solutions

World of Chemistry, 3rd edition

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