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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Steve Conner wrote ...
If you want oxygen, you have to use NaOH or KOH as your electrolyte. Imagine how much worse the explosions would be! Maybe once the reaction has run for a while with NaCl, the NaOH produced can give you oxygen.
I completely agree with your observations on hazardous caustic electrolytes, but there is no need to use them. Electrolysis of aqueous NaHCO3 - (sodium bicarbonate aka sodium hydrogen carbonate aka bicarbonate of soda) - the acid indigestion remedy - will yield hydrogen and oxygen without producing noxious by-products or corrosion of the electrodes.
This one time, I was trying (badly) to attempt electroplating. Electroplating failed. Electrolysis worked really well. If it had produced chlorine, I wouldn't be able to notice it from sinus problems and because I am used to the smell of chlorine (I have a pool). I had used aluminum foil as my electrodes connected to a broken wall charger of 12V (It strangely produces 14 though) and 1.5A. I connected pennies and paper clips to them (I didn't know anything then...). What happened three hours later was I had a hot, gunky, dark green substance where the salt water should have been. Now only I learn that it can contain HCl. If I knew that... I wouldn't have stuck my hand in the solution several times to pull out fallen pennies and dissolved paper clips...
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
HighVoltageChick wrote ...
Now only I learn that it can contain HCl. If I knew that... I wouldn't have stuck my hand in the solution several times to pull out fallen pennies and dissolved paper clips...
When dealing with most chemicals I wear vinyl gloves to protect my hands. Some gloves will not stop certain compounds. I remember at college one of the chemistry professors was using a mercury compound (dimethylmercury) for calibrating an NMR machine. It is highly toxic. More importantly, the gloves she was wearing were not impervious to the compound. She died a few weeks later from irreversible mercurial poisoning.
Registered Member #531
Joined: Sat Feb 17 2007, 10:51AM
Location: Burlington, Vermont
Posts: 125
The explosion of a H2/Cl2 mixture is a classic chemistry experiment demonstrating activation energy. Photons of red light will not trigger the reaction, photons of blue light will. Typically this is done on a small (test tube) scale with a loose fitting stopper. Electrolyzed brine is often the source of the gasses.
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making hydrogen and oxygen from electrolysis
