bismuthate
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solder trouble
I put 50% Lead 50% tin solder in vinegar and an odd percipitate formed any idea whatit is?
[Edited on 5-10-2013 by bismuthate]
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Boffis
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Lead may dissolve out of the solder but tin will not so if your ppt is grey I suspect it is tin. I would have thought that the reaction of solder with
vinegar (4-5% acetic acid) would be very slow even if heated. I must admit I have never tried it!
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bismuthate
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It took a month. My percipitate is tan powder.
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hyfalcon
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I'm going to hazard a guess. I might be wrong but I would suspect tin oxide. Lead acetate is soluble at room temperature. Any tin acetate that
would form would decompose to tin oxide.
[Edited on 6-10-2013 by hyfalcon]
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Boffis
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A month! In that case I go with hyfalcon's suggestion. The colour suggests a mixture of stannic oxide (white) and stannous oxide (dark brown).
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bismuthate
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thanks! this is a good way to seperate solder.
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macckone
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I would think the reaction could be sped up by bubbling air through the mix. That might speed things up enough to make it practical.
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bismuthate
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That may be what I will do with my next batch of lead acetate thanks.
lead iodide is amazing I just love making it so I've made a lot of acetate lately..
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Metacelsus
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You can probably find lead sinkers at a local fishing store, which are almost pure lead (they are banned in some states, due to waterfowl poisoning ).
This would save you the trouble of extracting lead from solder. Be careful and don't get lead poisoning!
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UnintentionalChaos
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The solid may also contain considerable amounts of basic lead acetate unless your acetic acid is in excess.
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
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bismuthate
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UnintentionalChaos the product is of no concern as long there is a soluble lead salt impurities in the percipitate are no problem, but thanks for the
tip.
Chedite Cheese I did look at sinkers, but ironicly they were 50% lead.
The rest was said to be "other" which is concerning. I remember once I saw rat poison labled 99% other.
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ScienceSquirrel
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In my experience, European fishing sinkers are mainly lead but I think thay can contain small amounts of tin and antimony as they are made up from
scrap lead from old pipes, recovered bullets, wheel weights, etc.
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bismuthate
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Shame that I live on the island of stability here the sinkers are made of super heavy elements.
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AJKOER
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I once slowly dissolved Lead/Silver solder in a mixture of vinegar/dilute H2O2 in a course of a few days (refresh the H2O2). There still was a small
amount of a black residue.
Note, Silver acetate is soluble in acetic acid, but in more neutral solutions, it forms a white (cottage cheese like) precipitate.
Also, Lead acetate presents a higher poisoning risk via skin absorption than other insoluble Lead salts (where, I suspect, dust inhalation and direct
ingestion are primary concerns).
[Edited on 18-10-2013 by AJKOER]
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