[Aribo]

Hi,

Been reading about extractions and comfortable with the procedure but what I dont know is how much solvent to extract with? I ask because it says to use ether, ether is pretty expensive and I would like to use as little as possible.

Thanks

[Borek]

No general answer, as it depends on the extraction coefficient.

I remember as a rule of thumb to use the same volume of solvent as the volume of water solution (just divide the solvent into three parts). Say 100 mL of water solution - do three extractions using 30 mL of ether. But as every rule of thumb it is not guaranteed to work. Besides, I can remember it wrong, last time I did extraction was around 30 years ago..