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blogfast25
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Quote: Originally posted by Wizzard  | Here's some reference Be(SO)4 for you guys 
This was made from high-purity 98% sulfuric and high purity Beryllium lump, some fraction of a g of metal, to yeild around 1.5g of the salt.
I did not write down measurements... But it's close. The bottle is 1" and the salt is a bit hygroscopic to the point of deliquiesence.
[Edited on 3-13-2013 by Wizzard] |
Nice crystals, Wizz.
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woelen
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I also have some BeSO4 and this salt is not that hygroscopic. Maybe wizzard's product is so hygroscopic due to remains of H2SO4. I uploaded a picture
of my BeSO4.4H2O to wikipedia:
http://en.wikipedia.org/wiki/File:Beryllium_sulfate_4_hydrat...
The compound is not that interesting. I did some small experiments with the BeSO4 (the picture shown on Wikipedia is all I have, so my amount is very
limited). Its aqueous chemistry resembles that of aluminium sulfate. A flocculent precipitate of beryllium hydroxide can be made from this. This
redissolves in strongly alkaline solutions, similar to aluminium hydroxide, which dissolves in strongly alkaline solutions.
[Edited on 13-3-13 by woelen]
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blogfast25
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woelen: did you buy this BeSO4.4H2O in the photo?
It's true that it's a fairly ordinary compound and that Be2+ aqeuous chemistry is much more like Al3+ than Mg2+. But considering how many hoops I had
to jump through to obtain it from raw Beryl, I'm still quite glad I obtained it all the same. Once I've got a little more I'll probably go for
(NH4)2BeF4, the precursor to BeF2.
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Wizzard
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@blogfast - Thanks!
@woelen - That may be the case - There was a bit excess sulfuric acid present, and also a bit of undissolved Be! Over the course of about a year in a
plastic (barely sealed) container, they became a bit 'slimey', like they had just been taken from water.
One neat thing is they have some dispersion, like a diamond.. It's rather hard to capture. Perhaps I'll grow some larger crystals from my present
stock.
If only my hot plate wasn't dead 
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AndersHoveland
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What about trying to dissolve the beryl in boiling concentrated phosphoric acid ?
It can attack glass and fused quartz, though the reaction may take some time.
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blogfast25
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| Quote: Originally posted by AndersHoveland | What about trying to dissolve the beryl in boiling concentrated phosphoric acid ?
It can attack glass and fused quartz, though the reaction may take some time. |
Literature shows that untreated, raw Beryl is extremely acid-insoluble. Alkali fusion (the easiest method on a gram scale) and vitrification
by melting followed by extreme quenching are the most common treatments, to render it acid-soluble.
Beryl’s structure appears to be a bit of a solid solution of beryllia and alumina in silica, that kind of explains it.
I haven’t found any references to treatment with boiling conc. H3PO4 but that doesn't mean there aren't any.
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Admagistr
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Czech professor of Inorganic chemistry, Milbauer described a great method of separating Be from Al via the double salt - potassium beryllium oxalate.
I will look for the information and write down the details.
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