[zzoul]

Can somebody please help me with this?
I am trying to see how the molarity of the sulfuric acid in a car battery affects its voltage, but I cannot find any relevant information to the topic.

In my experiment, I am using two used batteries (empty), into which the H₂SO₄ is poured; one with a concentration of 20% and the other 40%. Then, I measured the voltage, but it did not give me 12V as it was supposed to. What did I do wrong??

[mike]

Maybe try searching for information on the Nernst equation.

[AWK]

Charge battery before testing.
http://en.wikipedia.org/wiki/Car_battery
http://www.uuhome.de/william.darden/carfaq4.htm#soc
http://www.batteryuniversity.com/index.htm