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If you run a direct current using pure nickel electrodes through a solution of NaOH in distilled water, you will separate the water into hydrogen and oxygen.

Are there any other reactions that could possibly take place that would release anything other than hydrogen and oxygen?

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    $\begingroup$ You can certainly exploit overpotential $\endgroup$ – Zenix Dec 28 '19 at 16:47
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    $\begingroup$ Unless you get rid of water, likely no. @Zenix please have a look at the Meta post regarding mobile links. $\endgroup$ – andselisk Dec 28 '19 at 16:49
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    $\begingroup$ @andselisk Had I known that earlier... I will take care in future, sorry for the inconvenience. $\endgroup$ – Zenix Dec 28 '19 at 16:55
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    $\begingroup$ @Zenix No prob, if this is more convenient for you, I guess it's OK to occasionally use mobile links for the comments. Just make sure you don't use them in the answers (comments are usually temporary, answers are meant to stay). $\endgroup$ – andselisk Dec 28 '19 at 17:04
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    $\begingroup$ @Zenix Yeah, overpotential would have an effect if only we had, say, sodium chloride. Since it's NaOH, I don't think there is much that can deviate from traditional water splitting. $\endgroup$ – andselisk Dec 28 '19 at 17:08

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