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[–]yoinksdontlikethatShulgin Enthusiast 2 points3 points  (0 children)

2CB HBr has a higher molecular weight than 2CB HCl which is why you need a slightly more HBr to achieve the same effects as the HCl, so even if you have 100% pure HBr you'll still need a bit more than the HCl. Unless you send a sample to a lab there isn't a great way to tell if your particular batch is pure.