formic acid, Hfor, has a Ka equal to about 1.8x10^-4. a student is asked to prepare a buffer having a pH of 3.

formic acid, Hfor, has a Ka equal to about 1.8x10^-4. a student is asked to prepare a buffer having a pH of 3.4 from a solution of formic acid and a solution of sodium formate having the same molarity. How many mililiters of the Nafor solution should she add to 25 ml of the Hfor solution to make the buffer?