rollercoaster158
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OTC Hydrofluoric Acid
I have no idea what to make of this. It appears that Whink brand rust remover contains 3% hydrofluoric acid, something that is extremely difficult to
obtain otherwise. You can buy a 16 floz bottle of it at Ace hardware for a few bucks. Is this one of those "too good to be true" moments, or are we
looking at cheap over the counter hydrofluoric acid? If so, then we have some easy synthesis routes to NaF and even fluoroform. Here's a picture of
the bottle, you can easily read "contains hydrofluoric acid" on the warning text.
http://mserv.toolking.com/catalog/product/W/h/Whink_Products...
[Edited on 5-17-2012 by rollercoaster158]
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blogfast25
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3 % and a load of other junk. Not worth bothering with, IMHO.
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Polverone
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It contains a small amount of denatonium benzoate also to discourage ingestion. It could be purified by simple distillation. It is a convenient source
of HF, albeit dilute and with a high price per mole.
PGP Key and corresponding e-mail address
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Mailinmypocket
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Depending on what you need HF for it might be easier and cheaper to use ammonium bifluoride as it forms Hydrofluoric acid in situ. Elemental
scientific sells it at a reasonable cost!
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AJKOER
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In diamond district of New York City, you can buy a large plastic bottle of concentrated HF OTC if you are involved in the diamond business. What is
scary is that the people who buy this stuff (to remove impurities from raw diamonds) just carry it down a busy street and may not even know its
properties. What if they dropped a bottle and it ruptured? At least a chemist would know to hold his breath and run.
I agree with the in situ preparation route.
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rollercoaster158
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Well, I thought that HF was expensive after I checked all the chemical suppliers. I was just interested. Maybe we can use a vacuum to siphon out all
the HF gas, then redissolve it in much less water. It'll be purer and more concentrated. Keep in mind that I don't really need HF, I was just
surprised that such a powerful and difficult to obtain acid would be in the grocery store.
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S.C. Wack
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No membership on the internet is more familiar with what's in things.
Stores also used to have methanearsenate, tryptophan, and sodium hydroxide.
Having no use for the acid, neutralization and evaporation gave perfectly good NaF, many years ago. Still have some.
[Edited on 18-5-2012 by S.C. Wack]
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