Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge)

PbO2 + Pb + 2H2SO4 → 2PbSO4 + 2H2O

Visão geral

During discharge, lead dioxide (cathode, Pb⁴⁺) is reduced to lead sulfate while lead metal (anode, Pb⁰) is oxidized to lead sulfate. Both electrodes convert to PbSO₄, and the sulfuric acid electrolyte is consumed. The cell potential is 2.05 V. Charging reverses the reaction.

Participantes

Papel Substância Coeficiente Estado
Reagente Lead Pb 1 (s)
Reagente Sulfuric Acid H₂SO₄ 2 (aq)
Produto Water H₂O 2 (l)

Exemplo do cotidiano

Every car battery is a lead-acid battery using this reversible redox reaction. Starting your car draws hundreds of amps from this reaction.

Importância industrial

As baterias de chumbo-ácido representam uma indústria global de mais de 40 mil milhões de dólares, usadas em veículos, sistemas UPS e armazenamento de energia. Mais de 99% das baterias de chumbo-ácido são recicladas.

Propriedades

Tipo
Redox
Reversível
Sim
Energia
Exotérmico
ΔH
-359,4 kJ/mol

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Frequently Asked Questions

What is the equation for Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge)?
The balanced equation is: PbO₂ + Pb + 2H₂SO₄ → 2PbSO₄ + 2H₂O.
What type of reaction is Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge)?
Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge) is a redox reaction. It is reversible under certain conditions.
Is Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge) exothermic or endothermic?
Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge) is exothermic (releases energy). The enthalpy change (ΔH) is -359.4 kJ/mol.