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Water alone does not lower pH, only acid does.
No you can't just raise the pH again to get freebase, you have to first filter the salt, dry it, then dissolve it in water and then you can raise the pH again to get freebase.
Basically you should work with very dry liquids if you want to salt out something, because as we know salt always dissolves in water, thus any water content is bad for yield. If your acid contains 15% water, 0.75ml of water in 5ml acid can give you less yield, plus the water that is still in the acetone. Cooling the solutions makes sense because the solubility decreases with the temperature and therefore the yield increases. It is best to dry the solution with MgSO4 in the freezer.
If you add acetone to the freebase/IPA you can counteract the effect of too much solvent, more salt precipitates again, at least this is the case with sulfate.
You can also let the solvent evaporate, but you should not use too much heat for this.
~200°C, but the freebase would decompose before that. I was told not to make freebase warmer than 60°C, otherwise yield lost.
No you can't just raise the pH again to get freebase, you have to first filter the salt, dry it, then dissolve it in water and then you can raise the pH again to get freebase.
Basically you should work with very dry liquids if you want to salt out something, because as we know salt always dissolves in water, thus any water content is bad for yield. If your acid contains 15% water, 0.75ml of water in 5ml acid can give you less yield, plus the water that is still in the acetone. Cooling the solutions makes sense because the solubility decreases with the temperature and therefore the yield increases. It is best to dry the solution with MgSO4 in the freezer.
If you add acetone to the freebase/IPA you can counteract the effect of too much solvent, more salt precipitates again, at least this is the case with sulfate.
You can also let the solvent evaporate, but you should not use too much heat for this.
~200°C, but the freebase would decompose before that. I was told not to make freebase warmer than 60°C, otherwise yield lost.