Hello, I have the following problem: What volumes of 0.200 M HCOOH and 2.00 M NaOH would make 500.0 mL of a buffer with the pH of one made from 475 mL 0.200 M benzoic acid and 25 mL of 2.00 M NaOH? I have determined that the pH of the buffer should be 9.23. Now, I am stuck on how I would assemble the buffer. Moreover, I determined that the ratio of the week conjugate base to week acid is 5.31 ( CH3COO / CH3COOH ). What do I need to do next? Thanks.