Question: each acidconjugate base pair has a characteristic ph zone in...
Each acid-conjugate base pair has a characteristic pH zone in which it is an effective buffer. The HPO4^2-/PO4^3- pair can serve as an effective buffer system between approximately:
a) pH 5.9 and pH 7.9
b) pH 1.14 and pH 3.14
c) pH 11.4 and pH 13.4
d) None of these answer is correct