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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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FranklinNewhart
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[*] posted on 8-2-2017 at 10:16


Quote: Originally posted by hissingnoise  
Whew! Boiling down large volumes of malodorous liquid---great way to "piss" off the neighbours. . .
And large volumes would surely be needed.


During the Civil War the South had the ladies donate their pee to be used as nitrate for gun powder. It had to be boiled down to use it and when it was made into Gunpowder it really pissed of the neighbours to the North.
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