| Hey mg this is one area I can help with.
I hate to be the bearer of bad news but I believe you killed your product by heating it with conc h2s04 (concentrating as you boiled the water off). The black sounds like charred product.
I know, I've done it. M + conc h2s04 + heat = black burnt looking/smelling inactive crap.
You need to be careful and only use as much acid as is required to salt the M. |