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

PbO2 + Pb + 2H2SO4 → 2PbSO4 + 2H2O

概要

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.

参加者

役割 物質 係数 状態
反応物 Lead Pb 1 (s)
反応物 Sulfuric Acid H₂SO₄ 2 (aq)
生成物 Water H₂O 2 (l)

日常の例

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

産業上の重要性

鉛蓄電池は車両・UPS・エネルギー貯蔵に使われる400億ドル超の世界産業を支えている。99%リサイクル可能であり、循環経済の模範的製品の一つとされる。

特性

タイプ
Redox
可逆的
はい
エネルギー
発熱性
ΔH
-359.4 kJ/mol

関連する反応

Iron(II) to Iron(III) Oxidation by Oxygen Bleaching with Sodium Hypochlorite Copper Reduction of Silver Ion Aqua Regia Dissolving Gold Cerium(IV) Reduction by Iron(II) Chlorine Oxidation of Bromide Copper Oxidation by Nitric Acid Hypochlorite Oxidation of Hydrogen Peroxide Hydrogen Peroxide as Oxidizing Agent (Acidic) Displacement of Hydrogen from Acid by Magnesium

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.