dann2 - 21-7-2007 at 19:27
Hello,
Can anyone tell me of a readily available diaphram that can be used for production of Chlorine gas via. a cell containing NaCl.
TIA,
Dann2
ps. This board is nigh impossible to search either by it's own search facility or Google, or is it just me.
tumadre - 21-7-2007 at 19:35
<a href = "https://sciencemadness.org/talk/viewthread.php?tid=8180" >=https://sciencemadness.org/talk/viewthread.php?tid=8180 <a/>
Twospoons - 21-7-2007 at 21:04
Curious, I'm just in the process of building a 4 cell electrolyser for making hydrogen (the kids love floaty ballons, and I'm sick of the mess from
runaway Al + NaOH 
). A bit of research led me to non-woven Polypropylene cloth
- its resistant to all sorts of things. OTC source: weedmat and reusable supermarket shopping bags! $2 later I had more than enough cloth for my
cells.
http://www.nzbagit.co.nz/home/
chloric1 - 22-7-2007 at 06:02
Well, in the past I did divided cell experiments and aspire to start again. The plastic cloth twospoons described mighr be too porous.
I have two ideas for you involving terracota unglazed flower pots.
Idea #1: I tried this idea and it works well. With 2 lead strips make a solution of Epson salts(magnesium sulfate) say 100g to the liter of
distilled water. Put the negative electrode inside the flower pot and plug the bottom with plumbers putty. Fill the flower pot with the electrolyte
and a larger container with the remainder of your electrolyte. Immerse your positive electrode outside the pot in the larger container and switch on
the current. Now electrolyze this overnight or 2 days if you like and the pores of your unglazed pot will be filled with Mg(OH). When done, be
sure to rinse out the excess Mg(OH)2. This diaphragm is usefull for neutral and akaline experiments.
Idea #2: I have not yet tried this idea but plan to. Take an unglazed pot and immerse in a solution made of equal parts of water glass and distilled
water and let this sit overnight. Next day take pot out and let it dry in air or low heat in the oven. Immerse the pot in a solution of sulfuric
acid. I would say 20% would be strong enough. Remove from acid and rinse rinse. Dry pot and use as it has silica to restrict flow to a respectable
leve. not recommended for alkaline use.
12AX7 - 22-7-2007 at 09:53
Plain old plaster of paris is good for acid sulfate solutions.
Tim