Lead Acid
Thursday, August 11th, 2011How can I manually make a cell in the lead-acid battery using laboratory equipment school?
These include aqueous solution of sulfuric acid, lead sheet and lead dioxide powder. How do I create a single cell leads just to test the voltage?
Sulfuric acid should be fairly concentrated. Auto batteries use about 35% H2SO4 mass so that the ionization of the acid do not go to completion. You need a HSO4 + ions in a cell efficiently. You should probably have this experience in a container resistant glass. Pb sheet will be the anode and the cathode will PbO2. If your PbO2 is loose powder, you will need to contain it somehow. I suggest packing steep power in a test tube around a graphite core (you can get refills of graphite pencil or an old lantern battery). Now you have an anode and a cathode, you can assemble the cell. Add your concentrated acid in the glass container (to keep it well below the edge of the container). Attach thread (copper wire is good, if you have it) to a piece of sheet lead, and sink into the solution. Be careful not to let the wire touch the solution! Attach another wire to the graphite comes out of your test tube. Lower the test tube in the solution to the Pb02/graphite is soaked, being careful not to allow the wire touching the solution or to leave the tip of the tube over. Now connect each end of the wire to a voltmeter. It is your blood. If you do not get a reading, try switching the son. Notes of caution: - If you see bubbles, it is probably hydrogen gas. Be sure to ventilate your experience to avoid an explosive build-up. - The acid is very corrosive. Be careful in the handling and use eye protection before you even enter the laboratory. - Lead is toxic. Do not lick your fingers. Also, do the world a favor and find a safe way to dispose of the solution lead PbSO4 you generate. Dissolved lead is more toxic than solid metal.