Chapter 17.2, Problem 1CP

Which of the following combinations can be used to prepare a buffer?

a)

HCl/NaCl

b)

HF/KF

c)

${\text{NH}}_{\text{3}}{\text{/NH}}_{\text{4}}\text{Cl}$

d)

${\text{HNO}}_{\text{3}}{\text{/HNO}}_{\text{2}}$

e)

${\text{NaNO}}_{\text{2}}{\text{/HNO}}_{\text{3}}$