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.