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Chad's electrolysis example

Discussion in 'DAT Discussions' started by bigbutrealdreams, Aug 25, 2015.

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  1. bigbutrealdreams

    bigbutrealdreams
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    Hi guys, hopefully you can understand my handwriting.

    This example is from Chad's video. He chose two reactions (that I underlined in pink), but why did he choose those two?

    Thanks =)
     

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    #1 bigbutrealdreams, Aug 25, 2015
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  2. BeaverLover

    BeaverLover SDN Gold Donor
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    Those are the products because its "easier" to form due to a lower voltage required
     
    #2 BeaverLover, Aug 25, 2015
  3. gooperwooper

    gooperwooper
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    in aqueous electrolysis you take into account water as well. water also has a redox potential. So if you look at a redox table like this one: http://4.bp.blogspot.com/_1o3LAWhybpQ/TRLzpnHH5yI/AAAAAAAAAAw/3yRE84ZtmkI/s1600/Picture3.png

    you can see that water can be reduced and can also be formed through oxidation. reduction happens at the cathode, so for 1 you compare the reduction potential of Na versus the reduction potential of water. Whichever voltage is higher is easier to form, so that would be the reaction that actually occurs.
     
    #3 gooperwooper, Aug 25, 2015
    bigbutrealdreams likes this.
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