Question

Calculate the volumes of 0.20 M acetic acid and 0.20 M sodium acetate needed to make 20.00 mL of a buffer having pH = 5.00. Repeat analogous, separate calculations for buffers having pH = 4.00 and pH = 6.00. Hint: set up two equations with two unknowns; the first is the Henderson-Hasselbalch equation, the second is the fact that the volumes of HA (x mL) and A− (y mL) solutions should sum to 20 mL. In the Henderson-Hasselbalch equation, use the same x mL and y mL for the ratio, since the concentrations of the HA and A− solutions are the same, and the change in the ratio is due to the different volumes.

Answer 1