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Amphetamine is a weak base and sulfuric acid is a strong acid, hence amphetamine sulfate is expected to be slightly acidic (5-6 pH). Unless the colour of the powder is pink, you didn’t overacidify it and there’s no need to do anything - don’t try to fix something that isn’t broken.

If you calculate the theoretical yield based on molar mass of amphetamine and sulfuric acid, you’ll find out that it should be possible to turn 135,21 grams (1 mole) of amphetamine into 184,25 grams (1 mole) of amphetamine sulfate (100% yield). So yes, it’s possible that you got “110% yield”...

Fe/HCl can reduce nitro group to amine, but it can’t reduce double bonds. So no, it can’t be directly reduced to amphetamine.

It depends on what ephedrone you're working it. If it's L-ephedrone then D-meth should be produced (same as L-ephedrine derived from plants produces D-meth). If it's a racemic mixture then you'd obtain racemic meth.

You could reduce ephedrone (methcathinone) to methamphetamine with hydroiodic acid and red phosphorus if your goal is making meth. No need to turn it into ephedrine in the first place.

L-tartaric acid is like 10 euros per 1 kg where I live. Where are you from?

I’m not Patton, but: it’d produce only D-meth of the ephedrine that was used was derived from a plant, since plants naturally only produce L-ephedrine (which turns into the opposite enantiomer after reaction - D-meth in this case). If chemically synthesized ephedrine was used, than you’d get...

Could a normal paper fillter be used for filltration, or would a borosilicate glass filter need to be used instead? Since amphetamine is a weak base with pH about 11.

Would the lack of solubility of d-aspartic acid in isopropyl alcohol be a problem?

Could d-aspartic acid be used instead of d-tartaric acid?

Hello, I was just searching for different ways on how ephedrine can be extracted from ephedra sinica, and I came across some guy who’s got a friend from Afghanistan, where they allegedly use this method: ingredients: 1000 grams of ephedra powder 5000 ml of water 3000 ml of gasoline 100 grams...