which-step-is-crucial-when-calculating-the-ph-of-a-diprotic-buffer-system-using-

Question

Which step is crucial when calculating the pH of a diprotic buffer system using the Henderson-Hasselbalch equation?

Accepted Answer

Using the correct pK_a value for the forms present

Answer

Using the sum of K_a1 and K_a2

Answer

Assuming equal concentrations of all forms

Answer

Ignoring the concentration of the base form