Lead-Acid Battery Discharge
Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
Visão geral
During discharge, lead is oxidized to PbSO₄ at the anode while PbO₂ is reduced to PbSO₄ at the cathode, consuming sulfuric acid and producing water. The cell voltage is about 2.1 V, and six cells in series give the standard 12.6 V car battery. Invented by Gaston Planté in 1859, it remains the world's most recycled product.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Reagente | Lead Pb | 1 | (s) |
| Reagente | Sulfuric Acid H₂SO₄ | 2 | (aq) |
| Produto | Water H₂O | 2 | (l) |
Exemplo do cotidiano
The 12V battery that starts your car every morning uses this exact lead-acid chemistry, invented over 160 years ago.
Importância industrial
As baterias de chumbo-ácido representam um mercado global de 45 mil milhões de dólares. Com 99% de reciclabilidade, dominam o arranque automóvel, os UPS e a reserva de telecomunicações.
Propriedades
- Tipo
- Electrochemical
- Reversível
- Sim
- Energia
- Exotérmico
- ΔH
- -359,0 kJ/mol
Reações relacionadas
Electrorefining of Copper
Alkaline Battery Discharge
Anodizing of Aluminum
Chlor-Alkali Electrolysis
Nickel-Metal Hydride Battery
Daniell Cell (Zinc-Copper Galvanic Cell)
Electrolysis of Molten NaCl (Downs Process)
Hall-Héroult Process (Aluminum Smelting)
Electrowinning of Zinc
Electrolysis of Water
Frequently Asked Questions
What is the equation for Lead-Acid Battery Discharge?
The balanced equation is: Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O.
What type of reaction is Lead-Acid Battery Discharge?
Lead-Acid Battery Discharge is a electrochemical reaction. It is reversible under certain conditions.
Is Lead-Acid Battery Discharge exothermic or endothermic?
Lead-Acid Battery Discharge is exothermic (releases energy). The enthalpy change (ΔH) is -359.0 kJ/mol.