I have a rather simple problem, but I was never very good at acid-base chem math--I am more of an algebra guy and so I have trouble remembering when to switch one variable out with another, etc.
I am trying to make a 10% N-acetylcysteine solution, pH corrected with NaOH to a pH of 6.5. I have already done the math and a 10% NAC solution is around .613M, which yields a solution with a pH of 1.73. Now, I just need to figure out how to account for the reactions between the NAC conjugate base and the NaOH.
As a type this post, I'm suspecting that, as with much in acid-base math, I can just ignore the [A-] at such a low pH? I mean, if the pKa is 3.24, then there should be at least some sort of [A-] value, right? I can never feel confident with my conclusions on acid-base math, darnit!