1. The problem statement, all variables and given/known data You need to prepare 2000 L of buffer pH 3.9. You have available 0.2 M NaOH solution and 0.2 M Acetic acid (pKa=4.8). How much of each solution do you need? 2. Relevant equations I know that I have to use the H-H eqn: pH = pKa + log([HA]/[A-]) 3. The attempt at a solution When I plug the pH and pKa into the eqn, I get that the ratio of [HA]/[A-] = .126 This is where I’m not sure what to do. Is there another equation that I can use and then solve the 2 simultaneously? I feel that that’s probably the case, I just am unsure of how to set it up. Any suggestions would be greatly appreciated.