How to: testing weather a chemical is its freebase version or acid salt. e.g. NBOMe's

[collinz12]

To answer the question weather a chemical (e.g. NBOMe's) you have is its freebase or not can be done by melting point, but this is not accurate and easy if the melting point is above 100C. The easy way to determine if the chemical is its freebase or not is by testing the pH of a solution of it. What you need to do is get some pH paper, and pH paper is easily obtained because it's used to test the pH of pools etc. Next, we wanna add a drop of water to the end of the pH paper and we want to make the amount of water as SMALL as possible because it will make the answer apparent with less chemical used. For any chemical with a primary amine (all PEA's) or a secondary amine (all NBOMe's) or a tertiary amine (tryptamines) it will have a pKa of roughly 10-12 (the actual # is not of importance the theory behind it is: http://en.wikipedia.org/wiki/Henderson–Hasselbalch_equation). Moreover, amines have a much higher affinity for Hydrogen ion than water does (water pH and pKa are 7). For these reasons, if the chemical IS the freebase it will extract alot of H ions from the solution turning the pH paper green or blue. If the chemical is the acid salt, the amine will already be happy and it will release an almost unnoticeable amount of H ions INTO the solution turning the pH paper barely red if it's noticeable at all. I didn't really see anyone talking about this method for determining the answer, if it has already been said, sorry and anyways enjoy!