6. What is the assumption that the Hendersen-Hasselbach equation makes?
a) the Ka is small enough that the amount of dissociation is negligible for calculation purposes
b) the difference in pH from pKa of the conjugate acid is small
c) the concentrations of the acid-base species are large enough to be an effective buffer over small additions of acid or base
d) all of the above
e) none of the above