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You don't want to use anhydrous in a soxhlet, its better used for other applications. Its going to absorb a bit of water anyway.

you want to use azeotropic. (about 95%) <-- that is everclear i believe.


No need to acidify, the ethanol will extract everything by itself. You are going to need to remove the ethanol by distillation or evaporation after the soxhlet extract. You can't treat it like water and add base, either. The freebase is soluble in ethanol anyway.


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