Many demonstrations of electrolysis show the use of baking soda and a 9 volt battery for electrolysis of water. As a science experiment, I tested different voltages by adding more batteries. In my experiment, I used distilled water. After letting the electrolysis happen for 5 minutes, the 18 volt test had yellow discoloration in the water. Because I couldn't find any places online that mention this or explain what it is, I thought to ask. Perhaps it is not a common thing?

[Edit] Answer: Most likely cause was degradation of poor electrode material with too much electricity.

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    $\begingroup$ Electrode material is more important than you seem to assume. $\endgroup$ Jan 17, 2019 at 23:20
  • $\begingroup$ Note A: The electrodes (the exposed bits) I am using are stainless steel alligator clips. Note B: Kosher salt is NOT a suitable medium, it uses yellow prussiate of soda as an anti caking agent. YPoS (Ferrocyanide) is stable until mixed with Hydrogen and Ample electricity, after which it turns into hydrogen cyanide. $\endgroup$
    – Felix
    Jan 17, 2019 at 23:30
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    $\begingroup$ Stainless or not, pretty much any metal anode will dissolve. $\endgroup$ Jan 17, 2019 at 23:36
  • $\begingroup$ Thank you, I hadn't considered the electrodes as an input for contamination. Less worried now. $\endgroup$
    – Felix
    Jan 17, 2019 at 23:44
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    $\begingroup$ 18 volts are also pure overkill. Above 3 - 4 V or so, you just produce more heat with higher voltage. $\endgroup$
    – Karl
    Jan 18, 2019 at 0:15


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