A buffer solution is prepared by dissolving 1.40 g each of benzoic acid, C6H5CO2H, and sodium benzoate, NaC6H5CO2, in 250.0 ml of solution. Look in your textbook for any necessary equilibrium constants (a) What is the pH of this buffer solution? (b) Would you add 1.0 M NaOH or 1.0 M HCl to change the pH of the buffer to 4.60? How do you know which one to use? What is the ratio of the molarities of benzoate ion to benzoic acid when the pH of the buffer is equal to 4.60?