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Lead acid batteries

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    Lead acid batteries

    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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    Wanderer20001us is offline NETA Level III Pro Subscriber
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    Quote Originally Posted by sparky2005 View Post
    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?
    Negative plate reaction
    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)

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