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When a lead-acid battery is discharged, the electrolyte (sulfuric acid) and the active material on the plates of the battery (lead) are consumed to produce water and lead sulfate and current flow. The chemical equation for a lead-acid battery during discharge is: PbO2 Pb 2H2SO4 -->PbSO4 2H2O +Electrical energy. The chemical equation for a lead-acid battery during charge is the reverse with lead, sulfuric acid, and heat being yielded as well as some Hydrogen gas. Ideally, all of the lead sulfate is recombined with the hydrogen from the water to replenish the sulfuric acid. When a lead-acid battery is charged, electrical energy is added to the battery, causing the water and lead sulfate to be recombined to produce electrolyte and the active plate material. During normal charging, hydrogen gas is given off, however if internal damage to the plates or low electrolyte levels exist, internal gassing may create hydrogen sulfide gas. In sealed batteries this would normally not vent to the outside.

 

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14y ago
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6mo ago

Charging a lead acid battery can cause electrolysis of the electrolyte solution, which can produce hydrogen gas. The presence of sulfur in the electrolyte can react with the hydrogen gas to form hydrogen sulfide gas. This reaction can occur if the battery is overcharged or if it is being charged at high temperatures.

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Q: Why does charging lead acid battery give off hydrogen sulfide gas?
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Related questions

What type of gas is released when charging a lead acid battery?

hydrogen


What gas do you get from batteries?

Hydrogen is released during charging of a lead acid battery.


What hazardous gas will emit by lead-acid battery?

Hydrogen is released while charging.


Why should'nt any open flames be allowed when charging a battery?

A lead acid car battery releases hydrogen gas as it is charged. Hydrogen is highly flammable.


Can you smoke around a disconnected battery?

It's not healthy, but yeah. The trouble with a charging battery is hydrogen buildup from lead-acid (car) batteries.


Is hydrogen sulfide an acid or a base?

Hydrogen sulfide (H2S) is a weak acid. When dissolved in water, it can act as a weak acid, producing hydrosulfide ion (HS-) in solution.


Would hydrogen sulfide gas erode a plastic container holding the battery?

H2S is not likely to erode the plastic, but the acid from inside the battery definitely could.


How do batteries to produce hydrogen gas?

similar to separating the oxygen and hydrogen in water. When the battery fully charged it is made up of 64% water and 36% sulfuric acid and when the battery is in "charging" state by the alternator or charging source the electricity basically separates the water molecules (hydrogen from oxygen) giving of the hydrogen as bubbles.....sKD


What is the product of silver sulfide plus hydrochloric acid?

The reaction between silver sulfide and hydrochloric acid will produce silver chloride and hydrogen sulfide gas. Silver sulfide will react with hydrochloric acid to form silver chloride, which is a white solid precipitate, and hydrogen sulfide gas will be released in the reaction.


Is H2S a acid?

Yes, H2S (hydrogen sulfide) is an acid. It is a weak acid that can release hydrogen ions in solution.


Is H4S a base or acid?

H4S, or hydrogen sulfide, is a weak acid. When dissolved in water, it can ionize to produce hydronium ions and sulfide ions.


What is the systematic name for H2S?

Hydrogen Sulfide. It is present as a gas at room temperature, but is an acid.