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What is the primary reaction occurring in a lead-acid battery during discharge?

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Question: What is the primary reaction occurring in a lead-acid battery during discharge?

Options:

  1. Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
  2. PbSO4 + 2H2O → Pb + PbO2 + 2H2SO4
  3. 2Pb + 2H2SO4 → 2PbSO4 + H2
  4. PbO2 + 2H2SO4 → Pb + 2H2O + O2

Correct Answer: Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

Solution: 

During discharge, the primary reaction in a lead-acid battery is Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O.

What is the primary reaction occurring in a lead-acid battery during discharge?

Practice Questions

Q1
What is the primary reaction occurring in a lead-acid battery during discharge?
  1. Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
  2. PbSO4 + 2H2O → Pb + PbO2 + 2H2SO4
  3. 2Pb + 2H2SO4 → 2PbSO4 + H2
  4. PbO2 + 2H2SO4 → Pb + 2H2O + O2

Questions & Step-by-Step Solutions

What is the primary reaction occurring in a lead-acid battery during discharge?
Correct Answer: Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
  • Step 1: Understand that a lead-acid battery has two main components: lead (Pb) and lead dioxide (PbO2).
  • Step 2: Know that during discharge, the battery releases energy to power devices.
  • Step 3: Recognize that sulfuric acid (H2SO4) is also involved in the reaction.
  • Step 4: The reaction starts with lead (Pb) and lead dioxide (PbO2) combining with sulfuric acid (H2SO4).
  • Step 5: This combination produces lead sulfate (PbSO4) and water (H2O).
  • Step 6: The overall chemical reaction can be written as: Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O.
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