Arthur Dent
National Hazard
Posts: 553
Registered: 22-10-2010
Member Is Offline
Mood: entropic
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Cold finger - how it works
I read with interest the threads on iodine sublimation and how easier it is when you use a "cold finger" apparatus to condense the purified iodine. In
the near future, I will attempt to reclaim some elemental iodine from a batch of sodium iodide I have.
So I was at my favorite surplus store and spotted this lovely thing...
it's a nice cold finger, but i'm not sure how to secure it to the vessel I will use for the sublimation. It has a thin 1 cm-wide glass flange and
that's it!
Anyone knows how to secure such a fitting to a vessel? I selected a large 2 cm x 15 cm pyrex test tube as the sublimation vessel. I was thinking of
boring an extra big hole in a rubber stopper, but that can't be right?
Or is this setup incomplete and there's an actual piece of glassware that goes along with this cold finger?
Robert
--- Art is making something out of nothing and selling it. - Frank Zappa ---
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hissingnoise
International Hazard
Posts: 3940
Registered: 26-12-2002
Member Is Offline
Mood: Pulverulescent!
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A GG tapered flange would be more convenient for insertion into flasks!
A disk of soft rubber sheet, 2 or 3mm thick with a hole cut in it might be better than a bung . . .
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