Use the Henderson-Hasselbalch equation to perform the following calculations. The Ka of acetic acid is 1.8 ? 10-5. Review your calculations with your instructor before preparing the buffer solutions. • Buffer A: Calculate the mass of solid sodium acetate required to mix with 100.0 mL of 0.1 M acetic acid to prepare a pH 4 buffer. Record the mass in your data table. • Buffer B: Calculate the mass of solid sodium acetate required to mix with 100.0 mL of 1.0 M acetic acid to prepare a pH 4 buffer. Record the mass in your data table.