CWE question: amount of water

[ReynardTheFox]

Hi all, enough lurking, first post!

SWIM has a question about CWE. Most CWE references I've found recommend using a small amount of water for the extraction. Exact amounts vary, but a typical example would be 50ml for 20 tablets.

SWIM doesn't get this. Surely using MORE water would be better?

Once the solution has been filtered, some of the remaining sludge will contain X (where X is what you want to extract) - and surely the amount of X in the sludge is proportional to the concentration of the solution? So you would get a better % extraction by using a weaker solution, ie more water?

No? Barking up wrong fish?

Thanks!

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