Chemical action in lead acid battery, Physics

Chemical action in lead acid battery:

When the lead acid battery is delivering current, the sulphuric acid breaks up into Hydrogen ions (H2) carrying a positive charge and Sulphate ions (SO4) carrying a negative charge. The SO4 ions combine with the lead plate (Pb) and form lead sulphate (PbSO4). At the same time they give up their negative charge, thus creating an excess of electrons on the negative plate.

529_chemical action of lead battery.png

The H2 ions go to the positive plate and combine with the oxygen of the lead peroxide (PbO2) forming water (H2O), during the process they take electrons from the positive plate. The lead of the lead peroxide combines with some of the SO4 ions to form lead sulphate on the positive plate.

The result of this action is a deficiency of electrons on the positive plate and an excess of electrons on the negative plate.

When a circuit is connected to the battery, electrons flow from the negative plate to the positive plate. This process will continue until both plates are coated with lead sulphate. The lead sulphate is highly resistive, and it is mainly the formation of the lead sulphate which gradually lowers the battery capacity until it is discharged.

During charging, current is passed through the battery in a reverse direction. The SO4 ions are driven back into solution in the electrolyte, where they combine with the H2 ions of the water, thus forming sulphuric acid. The plates are thus returned to their original compositions.

The sulphuric acid is effectively used up as the battery is discharged, and returned to the electrolyte as it is charged, a test of the specific gravity of the electrolyte will give a good indication of the state of charge of the battery.





Posted Date: 9/13/2012 2:03:08 AM | Location : United States

Related Discussions:- Chemical action in lead acid battery, Assignment Help, Ask Question on Chemical action in lead acid battery, Get Answer, Expert's Help, Chemical action in lead acid battery Discussions

Write discussion on Chemical action in lead acid battery
Your posts are moderated
Related Questions
what is quatum number

In the following dissociation reaction, A 2 (g) is 42.7 % dissociated at equilibrium at 64.8 o C , and 1 bar pressure. A 2 (g)  ↔  2A Calculate D r G o for this proce

Demonstrate resonance and forced vibrations Consider four simple pendulums P,Q,R and S suspended from horizontal stretched rubber card AB. Let the lengths of pendulums p and R

Q. In 17 Cl 35, Compute the number of protons, neutrons and electrons. Number of electrons = 17, Number of protons = 17, Number of neutrons = 18

Permittivity of free space; electric constant; epsilon_0 The ratio of the electric displacement to the intensity of the electric field generating it in vacuum. This is equal to

A base of rectangular vessel measures 10cm x 8cm.

An experiment was carried out to measure forces acting in two members of a pin-jointed framework due to different applied loading conditions. Dial gages P and Q were calibrated and

i need a full explanation on magnetism

A certain spring is known to obey Hooke's Law.  If a force of 10 newtons stretches the spring 2 meters, how far will a 30 newton force stretch the spring? Ans: A certain spr