After the wash i should base it to about 12-13, so the meth amine goes up to the NP layer, right?
Then I should add HCl to PH is about 6.5 to move the meth.HCl to the H2O layer..
and evap, right
Right, first base to at least 13, then pH to 6.0 and swim should have no problems. Don't forget to recrystallize for final diamonds to rid any final nasties.
Hi jammin,
That's excellent news that the acetone rinse worked. I learnt that from reading Post 428410 (https://www.thevespiary.org/talk/index.php?topic=8697.msg42841000#msg42841000)
(geezmeister: "The post-reaction workup: a cook's summary", Stimulants)
I also learnt that you don't need a pH meter when titrating.
Heres some snippits
"WizardX gave some advice a long time back on this board to toss a few drops of HCl in water, toss it in the non-polar and shake well, then evaporate it. Keep evaporating each such pull by itself until you either get no more meth or the stuff you gets is so dirty its not worth messing with."
-------
"If you want the cream of batch, toss ten drops of acid in a 75 ml of dH2O and pour that into your non-polar solvent/meth solution in the separatory funnel. Shake like hell. Then shake some more, and when you are done, shake it again. Shake it like it meant something, because it does. Drain this out and evaporate it separately. Hey, so what if the pH is 8. You will already have some meth. Add another batch of water and acid, the pH falls more, you get more meth in the next pull. This is why most folks get the bigger yield on the second pull-- they have finally neutralized the mix."
So what you are doing is repeatively using a weak water/acid solution to 'pull' the meth out of the NP. Each time, the pH (of the water/acid/meth mixture) will be a bit lower. When it gets too low, you will see no more meth upon evaporation OR it will be soo dirty that its not worth eating.