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Author: Subject: Sodium nitrite from barium nitrite
artemov
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[*] posted on 6-2-2021 at 23:07
Sodium nitrite from barium nitrite


Ok an embarassingly simple question. I managed to get some barium nitrite recently, just wondering if I can get sodium nitrite via a simple double displacement reaction with sodium carbonate

Ba(NO2)2 (aq) + Na2CO3 (aq) -> 2NaNO2 (aq) + BaCO3 (s)

I need the sodium nitrite (aq) for an alkyl nitrite synthesis.
Is barium carbonate difficult to filter (I dun have vacuum filtration)?
How is the stability of sodium nitrite in solution?

I know I probably can use barium nitrite directly in the alkyl nitrite synthesis, but I dun really want to deal with barium in a shaking, frothing, bubbling situation ...

Also, ppting the barium as a carbonate first gives me a convenient barium salt for future use.

[Edited on 7-2-2021 by artemov]
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itsallgoodjames
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[*] posted on 6-2-2021 at 23:24


I don't have much experience with barium stuff, but if it's anything like CaSO4, it'd be a pain to filter. Waiting for it to settle and decanting might be an option, as is often used for CaSO4



Nuclear physics is neat. It's a shame it's so regulated...

Now that I think about it, that's probably a good thing. Still annoying though.
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Fyndium
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[*] posted on 7-2-2021 at 02:14


CaSO4 sludge is filterable with vacuum or sand pack filter, but needs patience and more water than is desired, which has to be concentrated later. The hotter the solution can be kept the better.

Clogging frits with CaSO4 is no issue, it is soluble in water at a rate of 1g/L so flushing it with lots after washes it away. Other method is to flush it with bicarb solution and acetic acid a couple of times. Carefully pushing air from below will cause the particles to flow backwards and this is my general step when cleaning these. Helps surprisingly lot.
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unionised
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[*] posted on 7-2-2021 at 03:46


It seems that nobody here knows how well BaSO4 filters.
It isn't a difficult experiment to find out.
Perhaps the OP would be kind enough to try it and post the results.
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artemov
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[*] posted on 7-2-2021 at 05:24


Quote: Originally posted by unionised  
It seems that nobody here knows how well BaSO4 filters.
It isn't a difficult experiment to find out.
Perhaps the OP would be kind enough to try it and post the results.


Erm it's actually BaCO3 ... but I guess I'll have to try it then. Cheers.
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[*] posted on 7-2-2021 at 06:31


Quote: Originally posted by artemov  
Quote: Originally posted by unionised  
It seems that nobody here knows how well BaSO4 filters.
It isn't a difficult experiment to find out.
Perhaps the OP would be kind enough to try it and post the results.


Erm it's actually BaCO3 ... but I guess I'll have to try it then. Cheers.

Doh!
Let us know how it turns out.
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zed
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[*] posted on 9-2-2021 at 00:31


React boiling solutions. Higher solubility in hot solution, should result in slower, larger crystal growth.

Producing a product that can be easily filtered. Or, isolated by decanting liquid.

Oh yeah. Not to be underestimated.... Soluble salts of Barium are toxic. Carbonate included.

Sulfate, not such a problem. Highly insoluble.

[Edited on 9-2-2021 by zed]
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artemov
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[*] posted on 10-2-2021 at 01:56


Quote: Originally posted by zed  
React boiling solutions. Higher solubility in hot solution, should result in slower, larger crystal growth.
[Edited on 9-2-2021 by zed]


Isn't sodium nitrite unstable in solution, perhaps more so in hot solution?



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