Question
Download Solution PDFWhat happens to lead acid’s electrolyte’s specific gravity while charging?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- The electrolyte in a lead-acid cell is dilute sulphuric acid (H2SO4) solution mixed in such a proportion so that with a fully charged battery, its specific gravity is about 1.28
- Dilute sulphuric acid is used as electrolyte by adding Sulphuric acid to water
- Spongy lead is used for negative plate
- Lead peroxide paste is used for positive plates
- It has low internal resistance
- It requires more charging time
- Gases are evolved during charging
- During the normal life of a battery that is properly cared for, the electrolyte loses none of the acids
- During the charging process, the specific gravity of the electrolyte (H2SO4) increases and provides an important indication to the state of charge of the cell
- The specific gravity of the electrolyte of a fully charged lead-acid cell is about 1.28; This can be measured by means of a hydrometer
In practice, the state of charge of a lead-acid cell (or battery) is determined from the specific gravity of the electrolyte. The following table is useful in this regard.
|
The specific gravity of H2SO4 |
State of charge |
|
1.13 |
Discharged |
|
1.19 |
25% charged |
|
1.22 |
50% charged |
|
1.25 |
75% charged |
|
1.28 |
100% charged |
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