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When doing water electrolysis hydrogen comes out negative or positive?

the hydrogen comes positive or negative? I'm not sure but I think oxygen comes out positif and hydrogen negative.

2 Answers

  • 9 years ago
    Favorite Answer

    Hydrogen comes "out" as hydrogen gas. Hydrogen gas consists of neutral H2 molecules. The oxygen that is produced exists as neutral O2 molecules. Neither is positive nor negative.

    If you mean the "positive" or "negative" electrode, then you need to be more careful in your wording of the question. When water molecules come into contact with the negatively charged electrode, hydrogen is reduced to H2 gas and OH- ions are formed in solution. When water molecules come into contact with the positively charged electrode, oxygen is oxidized to O2 gas and H+ ions are formed in solution.

    ============ Follow up ==============

    There is no such thing as an "oxide ion" (O^2-) in aqueous solution. Reduced oxygen in ionic form in aqueous solution only exists as the hydroxide ion.

    It is best NOT to try to define the anode or cathode in terms of positive or negative. It is better to describe the anode as the electrode where oxidation takes place, and the cathode as the electrode where reduction takes place. For an electrolytic cell, oxidation takes place at the anode which in that example happens to be positive, and reduction takes place at the cathode which for electrolysis is negative. In a voltaic cell, oxidation still occurs at the anode, and reduction still occurs at the cathode, but the positive and negative signs are reversed.

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  • 9 years ago



    hydrogen comes out at the negative end (anode) because it is positive.

    Source(s): use the periodic table?
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