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

PbO₂ + Pb + 2H₂SO₄ → 2PbSO₄ + 2H₂O

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Lead Pb	1	(s)
Chất phản ứng	Sulfuric Acid H₂SO₄	2	(aq)
Sản phẩm	Water H₂O	2	(l)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

Lead-acid batteries represent a $40+ billion global industry used in vehicles, UPS systems, and energy storage. Over 99% of lead-acid batteries are recycled.

Tính chất

Loại: Redox
Thuận nghịch: Có
Năng lượng: Tỏa nhiệt
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.