This is not a homework question, so I cannot give exact values or anything, sorry. If we have to make a buffer solution, and we know the pH and the pKa of the acid we are going to use, would it be true to say that if the pH < pKa, we will need more of the weak acid than salt? If pH > pKa, we would need more salt? Same thing for the pKb and pOH (14 - pH), would we need more salt if the pKb was bigger? More base if the pKb was smaller? If we have to prepare a buffer with a target pH, and pH = pKa, we need the same quantity of acid and salt respectively, correct? (so that pKa = pH - log1, since log1=0) BUT if we have pKa = 14 - pKb, what would be the reasonning then? I have a bit of trouble visualizing all that. Thank you, ~J.