Does the electrolyte in a lead acid battery bubble and then evaporate due to the the heat change associated with the electrochemical reactions in the battery or is it something else?

I think its like the electrolysis of water where u get hydrogen bubbles....

1 Answer
Jan 20, 2017

The bubbles are hydrogen gas produced by the electrochemical reaction : #Pb(s) + HSO_4^-""(aq)toH^+""(aq)+2e^-#


The hydrogen gas is doing something undesirable; it is coming out of aqueous solution and escaping as a gas. Modern Lead-Acid batteries are sealed so that most of the hydrogen gas remains in aqueous solution; this prolongs the life of the battery and increases its efficiency.