4.8. Study the figure below and answer questions that follows
Histidine Titration
Equivalents \( \mathrm{OH}^{-} \)
(a) Is a buffer used here "a good buffer"? Explain.
(5)
(b) What are the \( \mathrm{pKa} \) for titration reaction?
(3)
(c) Calculate the concentration of base used to determine for each pKa reached.
(6)
(d) Describe the terms: pKa, buffering capacity and pl.
(3)
