The question reads " In a Lead Acid battery, _______ is released at the positive and ________ is released at the negative, I answered Hydrogen and oxygen. It was wrong, can someone explain what i am missing?
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Junior Member
Posted January 22, 2019
The question reads " In a Lead Acid battery, _______ is released at the positive and ________ is released at the negative, I answered Hydrogen and oxygen. It was wrong, can someone explain what i am missing?
NETA Level IV
Posted January 22, 2019
Negative plate reactionOriginally Posted by sparky2005
Pb(s) + HSO−4(aq) → PbSO4(s) + H+(aq) + 2e−
The release of two conducting electrons gives the lead electrode a negative charge
As electrons accumulate they create an electric field which attracts hydrogen ions and repels sulfate ions, leading to a double-layer near the surface. The hydrogen ions screen the charged electrode from the solution which limits further reaction unless charge is allowed to flow out of electrode.
Positive plate reaction
PbO2(s) + HSO−4(aq) + 3H+(aq) + 2e− → PbSO4(s) + 2H2O(l)
