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Author: Subject: Isolation of urea from urine!
PHILOU Zrealone
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[*] posted on 5-2-2016 at 05:20


Quote: Originally posted by nelsonB  
If urea oxalate have low solubility in water,
i don't see why not urea carbonate to have a low solubility too,
just lowering the quantity of water in the urine,
then put some carbone dioxide in it to make carbonic acid,
and lower the temperature until its precipitate.


[Edited on 5-2-2016 by nelsonB]

Hint...it has to do with the low basicity of urea and with the low acidity and volatility of H2CO3...
HNO3 and oxalic acid are sufficiently acidic to form a urea salt, both can be used for precipitation of urea...




PH Z (PHILOU Zrealone)

"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
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jon albert
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[*] posted on 9-9-2016 at 03:15


Quote: Originally posted by chemoleo  
Of course, semi-fermented urine samples aren't pleasant. That's why I suggested boiling them.
But then, is the smell of ammonia pleasant? Surely not. Except, in the former case, ammonia is produced bacterially...

Anyway - the debate is not so much about the issue whether it's sterile or not (and I agree about your mid-stream sample), but simply whether this particular case is 'science that goes too far'. InfantigoTragus
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And I just happened to disagree on that :) - if anything, I'd say, the making of highly toxic nerve gases is science that goes to far, at least for the amateur chemist!


That makes a good sense!

[Edited on 9-9-2016 by jon albert]
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