bigbutrealdreams

2+ Year Member
Aug 24, 2015
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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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Dec 5, 2014
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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.
 
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