Everything I know is that pH needs to be 8,5 (adjusted with NH4OH, I think) in order for the enzymic reaction to take place in the continuous reactor. Changeing the pH to 2,8 is needed for precipitation of the amino acid. I thought, that, if I know the pH of 50% sulfuric acid, I would find how much (lit) H2SO4 I have to add to the solution (so it can reach the concentration of H+ at 2,8 pH).
Can it be that simple???