I am read this sentence in artical paper >
(( Successive extraction with petroleum ether (6×50 mL), ethyl acetate (3×100 mL), and n-butanol (3×50 mL) afforded fractions))
I would interprete these numbers as: 6 times extraction with 50 ml petroleumether, 3 times with 50 ml ethylacetate and 3 times with 50 ml n-butanol.
I doubt whether 6 extrations is essential. I learned that after 3 extractions (nearly) all has been removed.
I would interprete these numbers as: 6 times extraction with 50 ml petroleumether, 3 times with 50 ml ethylacetate and 3 times with 50 ml n-butanol.
I doubt whether 6 extrations is essential. I learned that after 3 extractions (nearly) all has been removed.
In addition to the reply above, note the order going from hexane (non-polar) to n-butanol (more polar).
That is, the number of extraction times X (in) the volume of the solution used for extraction
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