Page 42 - CITS - Electrician - Trade Practical

v

ELECTRICIAN - CITS

EXERCISE 14 : Preparation of electrolyte for lead acid

battery

Objectives

At the end of this exercise you shall be able to
• select the type of acid mixture required to prepare electrolyte
• prepare an electrolyte with proper ratio of acid mixture
• test the specific gravity of electrolyte
• follow the safety precautions & use of PPE to prepare an electrolyte.

Requirements

Tools/Equipments
• Combination plier (150mm, insulated) - 1 No. • Lead acid battery (12 V) -1 No.
• Hydrometer - 1 No. Materials
• Neon tester (75mm, 500 V) - 1 No.
• Multi meter (Digital, 3 digit) - 1 No. • Sulfuric Acid (H SO ) - as reqd.
1/2
4
2
• PPE kit (Standard) - 1 Set. • Distilled water - as reqd.
• Glass jar/bowl - 1 No.
• Glass rod - 1 No.
Procedure
TASK 1 : Selection of acid mixture

1 Wear the proper PPE before starting the experiment.
2 Carefully place the container of Sulfuric Acid and glass bowl on wooden table.
3 Empty the old electrolyte thoroughly from lead acid battery.

TASK 2 : Preparation of Electrolyte
1 Pour the required quantity of distilled water into the glass jar/bowl.
2 Take the container of Sulfuric Acid (H SO ) and carefully open its lid. (An approximate ratio of solution to
2
4
prepare the electrolyte is 37% of Sulfuric Acid & 63% of distilled water)
3 Now slowly and with extreme care pour the Sulfuric Acid drop by drop into the distilled water. (Never make the
reverse action ie pouring the distilled water into Sulfuric Acid, which causes violent Reaction and generates
extreme heat)
4 Continue the pouring of Sulfuric Acid slowly into the distilled water and stir with glass rod until the Solution is
well mixed and specific gravity comes to 1.28
5 Allow the prepared solution to cool down to the room temperature and check the specific gravity.
6 Fill the prepared electrolyte into the compartment of cells of lead acid battery, and ensure that cells Are fully
submerged in the solution of electrolyte.
7 Connect the lead acid battery for charging and measure the charging voltage & current.

25