I thought about writing a separate post since benzoic acid has not received much attention so far. The greatest benefit of benzoic acid is that it can be used to detect the presence of even very minute amounts of DMT in the NPS. It also allows one to complete the extraction in a single day by...
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Benzoic acid can be easily made from sodium benzoate. Simply dissolve sodium benzoate in hot water and add HCl and benzoic acid will crash out immediately. You can calculate the amount of HCl needed for this reaction, but I'm too lazy to do that, so I just eyeball it, then filter out the left over water, add some more HCl to it and see if anything crashes out. The benzoic acid can further be purified by recrystallization from boiling water. Simply dissolve it in boiling water, let it rest and cool down over night, pour out the water, collect and wash the BA crystals with small amounts of cold water and dry them.