puzzledstudent
Harmless
Posts: 7
Registered: 16-10-2006
Member Is Offline
Mood: No Mood
|
|
extraction
in an extraction of a 1:1 mixture of benzoic acid and 1,4-dimethoxybenzene, after the benzoic acid is extracted and you're left with crude
1,4-dimethoxybenzene, i'm told to add saturated aqueous NaCl. why is that? please help.
|
|
|
Maja
Hazard to Others
Posts: 143
Registered: 27-2-2006
Member Is Offline
Mood: No Mood
|
|
I don't know from what you try to extract it .... But maybe to precipitate it from your solvent(I think it's alcohol?) ?
|
|
|
Nicodem
Super Moderator
Posts: 4230
Registered: 28-12-2004
Member Is Offline
Mood: No Mood
|
|
Maybe it just says to wash the extract with brine. That way it would make sense.
1,4-dimethoxybenzene is pretty much insoluble in water and using brine to reduce solubility is thus useless.
|
|
|
YT2095
International Hazard
Posts: 1091
Registered: 31-5-2003
Location: Just left of Europe and down a bit.
Member Is Offline
Mood: within Nominal Parameters
|
|
what extraction method do you use to seperate the 1:1?
perhaps it`s some sort of bizare neautralising method or even a typo?
\"In a world full of wonders mankind has managed to invent boredom\" - Death
Twinkies don\'t have a shelf life. They have a half-life! -Caine (a friend of mine)
|
|
|
unionised
International Hazard
Posts: 5105
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
The salt might be there to reduce the solubillity of the dimethoxybenzene. OTOH, it might be there to reduce the solubillity of the solvent. For
example ether is quite soluble in water. This ether/ water mixture is probably a much better solvent for the dimethoxybenzene than clean water or
brine. Also you can use less solvent this way because it doesn't get "lost" in the water layer.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
